91139313 has 4 divisors (see below), whose sum is σ = 121519088. Its totient is φ = 60759540.

The previous prime is 91139309. The next prime is 91139327. The reversal of 91139313 is 31393119.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91139313 - 2² = 91139309 is a prime.

It is a super-2 number, since 2×91139313² = 16612748748223938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91139813) 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, 15189883 + ... + 15189888.

It is an arithmetic number, because the mean of its divisors is an integer number (30379772).

Almost surely, 2^91139313 is an apocalyptic number.

It is an amenable number.

91139313 is a deficient number, since it is larger than the sum of its proper divisors (30379775).

91139313 is a wasteful number, since it uses less digits than its factorization.

91139313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30379774.

The product of its digits is 2187, while the sum is 30.

The square root of 91139313 is about 9546.6912069051. The cubic root of 91139313 is about 450.0235592604.

The spelling of 91139313 in words is "ninety-one million, one hundred thirty-nine thousand, three hundred thirteen".