215473284481 has 27 divisors (see below), whose sum is σ = 271469935593. Its totient is φ = 170450935200.

The previous prime is 215473284469. The next prime is 215473284493. The reversal of 215473284481 is 184482374512.

The square root of 215473284481 is 464191.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (215473284469) and next prime (215473284493).

It can be written as a sum of positive squares in 4 ways, for example, as 180510268225 + 34963016256 = 424865^2 + 186984^2 .

It is not a de Polignac number, because 215473284481 - 2¹⁹ = 215472760193 is a prime.

It is a super-2 number, since 2×215473284481² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215473284431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 42238831 + ... + 42243931.

It is an arithmetic number, because the mean of its divisors is an integer number (10054442059).

Almost surely, 2^215473284481 is an apocalyptic number.

215473284481 is the 464191-st square number.

215473284481 is the 232096-th centered octagonal number.

It is an amenable number.

215473284481 is a deficient number, since it is larger than the sum of its proper divisors (55996651112).

215473284481 is an frugal number, since it uses more digits than its factorization.

215473284481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10242 (or 5121 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 49.

Multiplying 215473284481 by its sum of digits (49), we get a square (10558190939569 = 3249337²).

215473284481 divided by its sum of digits (49) gives a square (4397413969 = 66313²).

The spelling of 215473284481 in words is "two hundred fifteen billion, four hundred seventy-three million, two hundred eighty-four thousand, four hundred eighty-one".