91571916 has 24 divisors (see below), whose sum is σ = 217700784. Its totient is φ = 29947840.

The previous prime is 91571903. The next prime is 91571941. The reversal of 91571916 is 61917519.

It is a super-2 number, since 2×91571916² = 16770831599822112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 71355 + ... + 72626.

It is an arithmetic number, because the mean of its divisors is an integer number (9070866).

Almost surely, 2^91571916 is an apocalyptic number.

It is an amenable number.

91571916 is an abundant number, since it is smaller than the sum of its proper divisors (126128868).

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

91571916 is a wasteful number, since it uses less digits than its factorization.

91571916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144041 (or 144039 counting only the distinct ones).

The product of its digits is 17010, while the sum is 39.

The square root of 91571916 is about 9569.3216060492. The cubic root of 91571916 is about 450.7344647931.

The spelling of 91571916 in words is "ninety-one million, five hundred seventy-one thousand, nine hundred sixteen".