91914013 has 2 divisors, whose sum is σ = 91914014. Its totient is φ = 91914012.

The previous prime is 91913993. The next prime is 91914023. The reversal of 91914013 is 31041919.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71284249 + 20629764 = 8443^2 + 4542^2 .

It is a cyclic number.

It is not a de Polignac number, because 91914013 - 2⁵ = 91913981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91914023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45957006 + 45957007.

It is an arithmetic number, because the mean of its divisors is an integer number (45957007).

Almost surely, 2^91914013 is an apocalyptic number.

It is an amenable number.

91914013 is a deficient number, since it is larger than the sum of its proper divisors (1).

91914013 is an equidigital number, since it uses as much as digits as its factorization.

91914013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 91914013 is about 9587.1796165504. The cubic root of 91914013 is about 451.2950562102.

The spelling of 91914013 in words is "ninety-one million, nine hundred fourteen thousand, thirteen".