91513013 has 4 divisors (see below), whose sum is σ = 92171520. Its totient is φ = 90854508.

The previous prime is 91512997. The next prime is 91513027. The reversal of 91513013 is 31031519.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31031519 = 67 ⋅463157.

It is a cyclic number.

It is not a de Polignac number, because 91513013 - 2⁴ = 91512997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91513013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91513043) 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 3 ways as a sum of consecutive naturals, for example, 329045 + ... + 329322.

It is an arithmetic number, because the mean of its divisors is an integer number (23042880).

Almost surely, 2^91513013 is an apocalyptic number.

It is an amenable number.

91513013 is a deficient number, since it is larger than the sum of its proper divisors (658507).

91513013 is a wasteful number, since it uses less digits than its factorization.

91513013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658506.

The product of its (nonzero) digits is 405, while the sum is 23.

The square root of 91513013 is about 9566.2434110784. The cubic root of 91513013 is about 450.6378001241.

The spelling of 91513013 in words is "ninety-one million, five hundred thirteen thousand, thirteen".