91358212512 has 96 divisors (see below), whose sum is σ = 274156589952. Its totient is φ = 26094541824.

The previous prime is 91358212507. The next prime is 91358212513. The reversal of 91358212512 is 21521285319.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (91358212513) 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, 2452458 + ... + 2489430.

It is an arithmetic number, because the mean of its divisors is an integer number (2855797812).

Almost surely, 2^91358212512 is an apocalyptic number.

It is an amenable number.

91358212512 is an abundant number, since it is smaller than the sum of its proper divisors (182798377440).

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

91358212512 is a wasteful number, since it uses less digits than its factorization.

91358212512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40670 (or 40662 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The spelling of 91358212512 in words is "ninety-one billion, three hundred fifty-eight million, two hundred twelve thousand, five hundred twelve".