91616211013 has 2 divisors, whose sum is σ = 91616211014. Its totient is φ = 91616211012.

The previous prime is 91616210953. The next prime is 91616211023. The reversal of 91616211013 is 31011261619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61128606564 + 30487604449 = 247242^2 + 174607^2 .

It is a cyclic number.

It is not a de Polignac number, because 91616211013 - 2²¹ = 91614113861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91616211023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45808105506 + 45808105507.

It is an arithmetic number, because the mean of its divisors is an integer number (45808105507).

Almost surely, 2^91616211013 is an apocalyptic number.

It is an amenable number.

91616211013 is a deficient number, since it is larger than the sum of its proper divisors (1).

91616211013 is an equidigital number, since it uses as much as digits as its factorization.

91616211013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 91616211013 in words is "ninety-one billion, six hundred sixteen million, two hundred eleven thousand, thirteen".