91631912154 has 32 divisors (see below), whose sum is σ = 189355960320. Its totient is φ = 29530494000.

The previous prime is 91631912153. The next prime is 91631912173. The reversal of 91631912154 is 45121913619.

It is not an unprimeable number, because it can be changed into a prime (91631912153) 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, 38884 + ... + 429855.

It is an arithmetic number, because the mean of its divisors is an integer number (5917373760).

Almost surely, 2^91631912154 is an apocalyptic number.

91631912154 is an abundant number, since it is smaller than the sum of its proper divisors (97724048166).

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

91631912154 is a wasteful number, since it uses less digits than its factorization.

91631912154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469826.

The product of its digits is 58320, while the sum is 42.

The spelling of 91631912154 in words is "ninety-one billion, six hundred thirty-one million, nine hundred twelve thousand, one hundred fifty-four".