91397956 has 12 divisors (see below), whose sum is σ = 172250092. Its totient is φ = 42183648.

The previous prime is 91397869. The next prime is 91397989. The reversal of 91397956 is 65979319.

It can be written as a sum of positive squares in 2 ways, for example, as 13075456 + 78322500 = 3616^2 + 8850^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878775 + ... + 878878.

Almost surely, 2^91397956 is an apocalyptic number.

It is an amenable number.

91397956 is a deficient number, since it is larger than the sum of its proper divisors (80852136).

91397956 is a wasteful number, since it uses less digits than its factorization.

91397956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757670 (or 1757668 counting only the distinct ones).

The product of its digits is 459270, while the sum is 49.

The square root of 91397956 is about 9560.2278215532. The cubic root of 91397956 is about 450.4488624115.

The spelling of 91397956 in words is "ninety-one million, three hundred ninety-seven thousand, nine hundred fifty-six".