91479628817 has 2 divisors, whose sum is σ = 91479628818. Its totient is φ = 91479628816.

The previous prime is 91479628789. The next prime is 91479628853. The reversal of 91479628817 is 71882697419.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46435509121 + 45044119696 = 215489^2 + 212236^2 .

It is a cyclic number.

It is not a de Polignac number, because 91479628817 - 2²⁸ = 91211193361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91479628817.

It is not a weakly prime, because it can be changed into another prime (91479328817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45739814408 + 45739814409.

It is an arithmetic number, because the mean of its divisors is an integer number (45739814409).

Almost surely, 2^91479628817 is an apocalyptic number.

It is an amenable number.

91479628817 is a deficient number, since it is larger than the sum of its proper divisors (1).

91479628817 is an equidigital number, since it uses as much as digits as its factorization.

91479628817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 62.

The spelling of 91479628817 in words is "ninety-one billion, four hundred seventy-nine million, six hundred twenty-eight thousand, eight hundred seventeen".