91031813591942 has 16 divisors (see below), whose sum is σ = 136589222398464. Its totient is φ = 45502074765000.

The previous prime is 91031813591923. The next prime is 91031813591951. The reversal of 91031813591942 is 24919531813019.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93159317 + ... + 94131407.

It is an arithmetic number, because the mean of its divisors is an integer number (8536826399904).

Almost surely, 2^{91031813591942} is an apocalyptic number.

91031813591942 is a deficient number, since it is larger than the sum of its proper divisors (45557408806522).

91031813591942 is a wasteful number, since it uses less digits than its factorization.

91031813591942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986275.

The product of its (nonzero) digits is 2099520, while the sum is 56.

The spelling of 91031813591942 in words is "ninety-one trillion, thirty-one billion, eight hundred thirteen million, five hundred ninety-one thousand, nine hundred forty-two".