91939914013 has 4 divisors (see below), whose sum is σ = 91940637628. Its totient is φ = 91939190400.

The previous prime is 91939913999. The next prime is 91939914043. The reversal of 91939914013 is 31041993919.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 70098916644 + 21840997369 = 264762^2 + 147787^2 .

It is a cyclic number.

It is not a de Polignac number, because 91939914013 - 2⁹ = 91939913501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939914043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115188 + ... + 444013.

It is an arithmetic number, because the mean of its divisors is an integer number (22985159407).

Almost surely, 2^91939914013 is an apocalyptic number.

It is an amenable number.

91939914013 is a deficient number, since it is larger than the sum of its proper divisors (723615).

91939914013 is a wasteful number, since it uses less digits than its factorization.

91939914013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723614.

The product of its (nonzero) digits is 236196, while the sum is 49.

The spelling of 91939914013 in words is "ninety-one billion, nine hundred thirty-nine million, nine hundred fourteen thousand, thirteen".