91607139 has 32 divisors (see below), whose sum is σ = 150886400. Its totient is φ = 54548640.

The previous prime is 91607123. The next prime is 91607149. The reversal of 91607139 is 93170619.

It is not a de Polignac number, because 91607139 - 2⁴ = 91607123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91607119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6672 + ... + 15090.

It is an arithmetic number, because the mean of its divisors is an integer number (4715200).

Almost surely, 2^91607139 is an apocalyptic number.

91607139 is a deficient number, since it is larger than the sum of its proper divisors (59279261).

91607139 is a wasteful number, since it uses less digits than its factorization.

91607139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8472 (or 8466 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 91607139 is about 9571.1618416993. The cubic root of 91607139 is about 450.7922488299.

The spelling of 91607139 in words is "ninety-one million, six hundred seven thousand, one hundred thirty-nine".