91980902 has 16 divisors (see below), whose sum is σ = 150059952. Its totient is φ = 42031200.

The previous prime is 91980901. The next prime is 91980907. The reversal of 91980902 is 20908919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91980901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14888 + ... + 20139.

It is an arithmetic number, because the mean of its divisors is an integer number (9378747).

Almost surely, 2^91980902 is an apocalyptic number.

91980902 is a deficient number, since it is larger than the sum of its proper divisors (58079050).

91980902 is a wasteful number, since it uses less digits than its factorization.

91980902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35143.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 91980902 is about 9590.6674428843. The cubic root of 91980902 is about 451.4045039950.

The spelling of 91980902 in words is "ninety-one million, nine hundred eighty thousand, nine hundred two".