91217064312 has 96 divisors (see below), whose sum is σ = 269557470000. Its totient is φ = 27636149760.

The previous prime is 91217064269. The next prime is 91217064329. The reversal of 91217064312 is 21346071219.

91217064312 is a `hidden beast` number, since 9 + 1 + 2 + 1 + 7 + 0 + 643 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6288364 + ... + 6302852.

Almost surely, 2^91217064312 is an apocalyptic number.

It is an amenable number.

91217064312 is an abundant number, since it is smaller than the sum of its proper divisors (178340405688).

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

91217064312 is a wasteful number, since it uses less digits than its factorization.

91217064312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22461 (or 22454 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 91217064312 in words is "ninety-one billion, two hundred seventeen million, sixty-four thousand, three hundred twelve".