91409646131 has 2 divisors, whose sum is σ = 91409646132. Its totient is φ = 91409646130.

The previous prime is 91409645969. The next prime is 91409646151. The reversal of 91409646131 is 13164690419.

It is a strong prime.

It is an emirp because it is prime and its reverse (13164690419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91409646131 - 2¹⁴ = 91409629747 is a prime.

It is a super-2 number, since 2×91409646131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91409646151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45704823065 + 45704823066.

It is an arithmetic number, because the mean of its divisors is an integer number (45704823066).

Almost surely, 2^91409646131 is an apocalyptic number.

91409646131 is a deficient number, since it is larger than the sum of its proper divisors (1).

91409646131 is an equidigital number, since it uses as much as digits as its factorization.

91409646131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 91409646131 in words is "ninety-one billion, four hundred nine million, six hundred forty-six thousand, one hundred thirty-one".