90957131281 has 3 divisors (see below), whose sum is σ = 90957432873. Its totient is φ = 90956829690.

The previous prime is 90957131261. The next prime is 90957131329. The reversal of 90957131281 is 18213175909.

The square root of 90957131281 is 301591.

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 90957131281 - 2⁵ = 90957131249 is a prime.

It is a super-2 number, since 2×90957131281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90957131201) 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, 150796 + ... + 452386.

It is an arithmetic number, because the mean of its divisors is an integer number (30319144291).

Almost surely, 2^90957131281 is an apocalyptic number.

90957131281 is the 301591-st square number.

90957131281 is the 150796-th centered octagonal number.

It is an amenable number.

90957131281 is a deficient number, since it is larger than the sum of its proper divisors (301592).

90957131281 is an frugal number, since it uses more digits than its factorization.

90957131281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603182 (or 301591 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 46.

The spelling of 90957131281 in words is "ninety billion, nine hundred fifty-seven million, one hundred thirty-one thousand, two hundred eighty-one".