91415139 has 8 divisors (see below), whose sum is σ = 123005520. Its totient is φ = 60384096.

The previous prime is 91415113. The next prime is 91415143. The reversal of 91415139 is 93151419.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91415139 - 2⁷ = 91415011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91415339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139452 + ... + 140105.

It is an arithmetic number, because the mean of its divisors is an integer number (15375690).

Almost surely, 2^91415139 is an apocalyptic number.

91415139 is a deficient number, since it is larger than the sum of its proper divisors (31590381).

91415139 is a wasteful number, since it uses less digits than its factorization.

91415139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279669.

The product of its digits is 4860, while the sum is 33.

The square root of 91415139 is about 9561.1264503718. The cubic root of 91415139 is about 450.4770890741.

The spelling of 91415139 in words is "ninety-one million, four hundred fifteen thousand, one hundred thirty-nine".