91521355994031 has 8 divisors (see below), whose sum is σ = 122028564293424. Its totient is φ = 61014192512000.

The previous prime is 91521355994017. The next prime is 91521355994053. The reversal of 91521355994031 is 13049955312519.

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 91521355994031 - 2²⁹ = 91520819123119 is a prime.

It is a super-2 number, since 2×91521355994031² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91521355995031) 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, 6108336 + ... + 14844341.

It is an arithmetic number, because the mean of its divisors is an integer number (15253570536678).

Almost surely, 2^{91521355994031} is an apocalyptic number.

91521355994031 is a deficient number, since it is larger than the sum of its proper divisors (30507208299393).

91521355994031 is a wasteful number, since it uses less digits than its factorization.

91521355994031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22408681.

The product of its (nonzero) digits is 6561000, while the sum is 57.

The spelling of 91521355994031 in words is "ninety-one trillion, five hundred twenty-one billion, three hundred fifty-five million, nine hundred ninety-four thousand, thirty-one".