91531220140204 has 48 divisors (see below), whose sum is σ = 182705195030400. Its totient is φ = 39747776587776.

The previous prime is 91531220140193. The next prime is 91531220140223. The reversal of 91531220140204 is 40204102213519.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 91531220140204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13296324 + ... + 18969835.

It is an arithmetic number, because the mean of its divisors is an integer number (3806358229800).

Almost surely, 2^{91531220140204} is an apocalyptic number.

It is an amenable number.

91531220140204 is a deficient number, since it is larger than the sum of its proper divisors (91173974890196).

91531220140204 is a wasteful number, since it uses less digits than its factorization.

91531220140204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32269402 (or 32269400 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 91531220140204 in words is "ninety-one trillion, five hundred thirty-one billion, two hundred twenty million, one hundred forty thousand, two hundred four".