215800481 has 8 divisors (see below), whose sum is σ = 232516200. Its totient is φ = 199101312.

The previous prime is 215800477. The next prime is 215800511. The reversal of 215800481 is 184008512.

It can be written as a sum of positive squares in 4 ways, for example, as 180625 + 215619856 = 425^2 + 14684^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215800481 - 2² = 215800477 is a prime.

It is a super-2 number, since 2×215800481² = 93139695199662722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215800411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42431 + ... + 47243.

It is an arithmetic number, because the mean of its divisors is an integer number (29064525).

Almost surely, 2^215800481 is an apocalyptic number.

It is an amenable number.

215800481 is a deficient number, since it is larger than the sum of its proper divisors (16715719).

215800481 is a wasteful number, since it uses less digits than its factorization.

215800481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8275.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 215800481 is about 14690.1491142874. The cubic root of 215800481 is about 599.8152032746.

Adding to 215800481 its reverse (184008512), we get a palindrome (399808993).

The spelling of 215800481 in words is "two hundred fifteen million, eight hundred thousand, four hundred eighty-one".