91354431285 has 120 divisors (see below), whose sum is σ = 185040370944. Its totient is φ = 43018335360.

The previous prime is 91354431257. The next prime is 91354431359. The reversal of 91354431285 is 58213445319.

91354431285 is a `hidden beast` number, since 9 + 13 + 544 + 3 + 12 + 85 = 666.

It is not a de Polignac number, because 91354431285 - 2¹⁸ = 91354169141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91354431285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1545220 + ... + 1603250.

Almost surely, 2^91354431285 is an apocalyptic number.

It is an amenable number.

91354431285 is an abundant number, since it is smaller than the sum of its proper divisors (93685939659).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91354431285 is a wasteful number, since it uses less digits than its factorization.

91354431285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58097 (or 58075 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 91354431285 in words is "ninety-one billion, three hundred fifty-four million, four hundred thirty-one thousand, two hundred eighty-five".