91980313 has 4 divisors (see below), whose sum is σ = 92112228. Its totient is φ = 91848400.

The previous prime is 91980307. The next prime is 91980323. The reversal of 91980313 is 31308919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31308919 = 37 ⋅846187.

It can be written as a sum of positive squares in 2 ways, for example, as 87366409 + 4613904 = 9347^2 + 2148^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91980313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91980323) 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, 64906 + ... + 66307.

It is an arithmetic number, because the mean of its divisors is an integer number (23028057).

Almost surely, 2^91980313 is an apocalyptic number.

It is an amenable number.

91980313 is a deficient number, since it is larger than the sum of its proper divisors (131915).

91980313 is a wasteful number, since it uses less digits than its factorization.

91980313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131914.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 91980313 is about 9590.6367359003. The cubic root of 91980313 is about 451.4035404695.

The spelling of 91980313 in words is "ninety-one million, nine hundred eighty thousand, three hundred thirteen".