91504013 has 4 divisors (see below), whose sum is σ = 96886620. Its totient is φ = 86121408.

The previous prime is 91504009. The next prime is 91504031. The reversal of 91504013 is 31040519.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31040519 = 3359 ⋅9241.

It can be written as a sum of positive squares in 2 ways, for example, as 39980329 + 51523684 = 6323^2 + 7178^2 .

It is a cyclic number.

It is not a de Polignac number, because 91504013 - 2² = 91504009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91504013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91504613) 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, 2691278 + ... + 2691311.

It is an arithmetic number, because the mean of its divisors is an integer number (24221655).

Almost surely, 2^91504013 is an apocalyptic number.

It is an amenable number.

91504013 is a deficient number, since it is larger than the sum of its proper divisors (5382607).

91504013 is a wasteful number, since it uses less digits than its factorization.

91504013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382606.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 91504013 is about 9565.7729954249. The cubic root of 91504013 is about 450.6230267309.

The spelling of 91504013 in words is "ninety-one million, five hundred four thousand, thirteen".