91936613 has 2 divisors, whose sum is σ = 91936614. Its totient is φ = 91936612.

The previous prime is 91936571. The next prime is 91936631. The reversal of 91936613 is 31663919.

Together with next prime (91936631) 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., 67354849 + 24581764 = 8207^2 + 4958^2 .

It is a cyclic number.

It is not a de Polignac number, because 91936613 - 2⁶ = 91936549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91936643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45968306 + 45968307.

It is an arithmetic number, because the mean of its divisors is an integer number (45968307).

Almost surely, 2^91936613 is an apocalyptic number.

It is an amenable number.

91936613 is a deficient number, since it is larger than the sum of its proper divisors (1).

91936613 is an equidigital number, since it uses as much as digits as its factorization.

91936613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 91936613 is about 9588.3582014858. The cubic root of 91936613 is about 451.3320416205.

The spelling of 91936613 in words is "ninety-one million, nine hundred thirty-six thousand, six hundred thirteen".