91031625321 has 32 divisors (see below), whose sum is σ = 150864338688. Its totient is φ = 47541254400.

The previous prime is 91031625283. The next prime is 91031625341. The reversal of 91031625321 is 12352613019.

It is not a de Polignac number, because 91031625321 - 2¹⁰ = 91031624297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91031625341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1623166 + ... + 1678311.

It is an arithmetic number, because the mean of its divisors is an integer number (4714510584).

Almost surely, 2^91031625321 is an apocalyptic number.

91031625321 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

91031625321 is a deficient number, since it is larger than the sum of its proper divisors (59832713367).

91031625321 is a wasteful number, since it uses less digits than its factorization.

91031625321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301601.

The product of its (nonzero) digits is 9720, while the sum is 33.

The spelling of 91031625321 in words is "ninety-one billion, thirty-one million, six hundred twenty-five thousand, three hundred twenty-one".