91331608 has 8 divisors (see below), whose sum is σ = 171246780. Its totient is φ = 45665800.

The previous prime is 91331567. The next prime is 91331629. The reversal of 91331608 is 80613319.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 91331608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5708218 + ... + 5708233.

Almost surely, 2^91331608 is an apocalyptic number.

It is an amenable number.

91331608 is a deficient number, since it is larger than the sum of its proper divisors (79915172).

91331608 is a wasteful number, since it uses less digits than its factorization.

91331608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416457 (or 11416453 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 91331608 is about 9556.7571905956. The cubic root of 91331608 is about 450.3398387633.

The spelling of 91331608 in words is "ninety-one million, three hundred thirty-one thousand, six hundred eight".