91811901902 has 16 divisors (see below), whose sum is σ = 157558055040. Its totient is φ = 39306402168.

The previous prime is 91811901899. The next prime is 91811901913. The reversal of 91811901902 is 20910911819.

It is a self number, because there is not a number n which added to its sum of digits gives 91811901902.

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, 3449252 + ... + 3475767.

It is an arithmetic number, because the mean of its divisors is an integer number (9847378440).

Almost surely, 2^91811901902 is an apocalyptic number.

91811901902 is a deficient number, since it is larger than the sum of its proper divisors (65746153138).

91811901902 is a wasteful number, since it uses less digits than its factorization.

91811901902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6925975.

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 91811901902 in words is "ninety-one billion, eight hundred eleven million, nine hundred one thousand, nine hundred two".