7153971945481 has 3 divisors (see below), whose sum is σ = 7153974620173. Its totient is φ = 7153969270790.

The previous prime is 7153971945479. The next prime is 7153971945563. The reversal of 7153971945481 is 1845491793517.

The square root of 7153971945481 is 2674691.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 7153971945481 - 2¹ = 7153971945479 is a prime.

It is a super-2 number, since 2×7153971945481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7153971945451) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1337346 + ... + 4012036.

Almost surely, 2^{7153971945481} is an apocalyptic number.

7153971945481 is the 2674691-st square number.

7153971945481 is the 1337346-th centered octagonal number.

It is an amenable number.

7153971945481 is a deficient number, since it is larger than the sum of its proper divisors (2674692).

7153971945481 is an frugal number, since it uses more digits than its factorization.

7153971945481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5349382 (or 2674691 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 64.

Multiplying 7153971945481 by its sum of digits (64), we get a square (457854204510784 = 21397528²).

The spelling of 7153971945481 in words is "seven trillion, one hundred fifty-three billion, nine hundred seventy-one million, nine hundred forty-five thousand, four hundred eighty-one".