91121936 has 20 divisors (see below), whose sum is σ = 176876700. Its totient is φ = 45476352.

The previous prime is 91121923. The next prime is 91121939. The reversal of 91121936 is 63912119.

It can be written as a sum of positive squares in 2 ways, for example, as 61528336 + 29593600 = 7844^2 + 5440^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (91121939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4100 + ... + 14108.

It is an arithmetic number, because the mean of its divisors is an integer number (8843835).

Almost surely, 2^91121936 is an apocalyptic number.

It is an amenable number.

91121936 is a deficient number, since it is larger than the sum of its proper divisors (85754764).

91121936 is a wasteful number, since it uses less digits than its factorization.

91121936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10586 (or 10580 counting only the distinct ones).

The product of its digits is 2916, while the sum is 32.

The square root of 91121936 is about 9545.7810576191. The cubic root of 91121936 is about 449.9949563221.

The spelling of 91121936 in words is "ninety-one million, one hundred twenty-one thousand, nine hundred thirty-six".