91475906 has 4 divisors (see below), whose sum is σ = 137213862. Its totient is φ = 45737952.

The previous prime is 91475863. The next prime is 91475911. The reversal of 91475906 is 60957419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60957419 = 97 ⋅628427.

It can be written as a sum of positive squares in only one way, i.e., 54982225 + 36493681 = 7415^2 + 6041^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22868975 + ... + 22868978.

Almost surely, 2^91475906 is an apocalyptic number.

91475906 is a deficient number, since it is larger than the sum of its proper divisors (45737956).

91475906 is a wasteful number, since it uses less digits than its factorization.

91475906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45737955.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 91475906 is about 9564.3037383805. The cubic root of 91475906 is about 450.5768831866.

The spelling of 91475906 in words is "ninety-one million, four hundred seventy-five thousand, nine hundred six".