91279515 has 32 divisors (see below), whose sum is σ = 156660480. Its totient is φ = 45242496.

The previous prime is 91279459. The next prime is 91279519. The reversal of 91279515 is 51597219.

It is not a de Polignac number, because 91279515 - 2⁶ = 91279451 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (91279519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12084 + ... + 18126.

It is an arithmetic number, because the mean of its divisors is an integer number (4895640).

Almost surely, 2^91279515 is an apocalyptic number.

91279515 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

91279515 is a deficient number, since it is larger than the sum of its proper divisors (65380965).

91279515 is a wasteful number, since it uses less digits than its factorization.

91279515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6123.

The product of its digits is 28350, while the sum is 39.

The square root of 91279515 is about 9554.0313480750. The cubic root of 91279515 is about 450.2542020549.

The spelling of 91279515 in words is "ninety-one million, two hundred seventy-nine thousand, five hundred fifteen".