91516013 has 2 divisors, whose sum is σ = 91516014. Its totient is φ = 91516012.

The previous prime is 91515973. The next prime is 91516031. The reversal of 91516013 is 31061519.

Together with next prime (91516031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72965764 + 18550249 = 8542^2 + 4307^2 .

It is a cyclic number.

It is not a de Polignac number, because 91516013 - 2⁸ = 91515757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91516063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45758006 + 45758007.

It is an arithmetic number, because the mean of its divisors is an integer number (45758007).

Almost surely, 2^91516013 is an apocalyptic number.

It is an amenable number.

91516013 is a deficient number, since it is larger than the sum of its proper divisors (1).

91516013 is an equidigital number, since it uses as much as digits as its factorization.

91516013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 91516013 is about 9566.4002111557. The cubic root of 91516013 is about 450.6427243733.

The spelling of 91516013 in words is "ninety-one million, five hundred sixteen thousand, thirteen".