91123902 has 24 divisors (see below), whose sum is σ = 197641080. Its totient is φ = 30342960.

The previous prime is 91123883. The next prime is 91123913. The reversal of 91123902 is 20932119.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20652 + ... + 24672.

It is an arithmetic number, because the mean of its divisors is an integer number (8235045).

Almost surely, 2^91123902 is an apocalyptic number.

91123902 is an abundant number, since it is smaller than the sum of its proper divisors (106517178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91123902 is a wasteful number, since it uses less digits than its factorization.

91123902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5288 (or 5285 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 91123902 is about 9545.8840344936. The cubic root of 91123902 is about 449.9981925853.

The spelling of 91123902 in words is "ninety-one million, one hundred twenty-three thousand, nine hundred two".