90081963521 has 16 divisors (see below), whose sum is σ = 101862283776. Its totient is φ = 78922080000.

The previous prime is 90081963359. The next prime is 90081963533. The reversal of 90081963521 is 12536918009.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90081963521 is a prime.

It is a super-2 number, since 2×90081963521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90081963541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465890 + ... + 630251.

It is an arithmetic number, because the mean of its divisors is an integer number (6366392736).

Almost surely, 2^90081963521 is an apocalyptic number.

It is an amenable number.

90081963521 is a deficient number, since it is larger than the sum of its proper divisors (11780320255).

90081963521 is a wasteful number, since it uses less digits than its factorization.

90081963521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096424.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 90081963521 in words is "ninety billion, eighty-one million, nine hundred sixty-three thousand, five hundred twenty-one".