91191000902 has 16 divisors (see below), whose sum is σ = 140672594592. Its totient is φ = 44303454720.

The previous prime is 91191000881. The next prime is 91191000991. The reversal of 91191000902 is 20900019119.

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, 774299 + ... + 884262.

It is an arithmetic number, because the mean of its divisors is an integer number (8792037162).

Almost surely, 2^91191000902 is an apocalyptic number.

91191000902 is a deficient number, since it is larger than the sum of its proper divisors (49481593690).

91191000902 is a wasteful number, since it uses less digits than its factorization.

91191000902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659343.

The product of its (nonzero) digits is 1458, while the sum is 32.

The spelling of 91191000902 in words is "ninety-one billion, one hundred ninety-one million, nine hundred two", and thus it is an aban number.