91577120651 has 2 divisors, whose sum is σ = 91577120652. Its totient is φ = 91577120650.

The previous prime is 91577120647. The next prime is 91577120659. The reversal of 91577120651 is 15602177519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91577120651 - 2² = 91577120647 is a prime.

It is not a weakly prime, because it can be changed into another prime (91577120659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45788560325 + 45788560326.

It is an arithmetic number, because the mean of its divisors is an integer number (45788560326).

Almost surely, 2^91577120651 is an apocalyptic number.

91577120651 is a deficient number, since it is larger than the sum of its proper divisors (1).

91577120651 is an equidigital number, since it uses as much as digits as its factorization.

91577120651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 44.

The spelling of 91577120651 in words is "ninety-one billion, five hundred seventy-seven million, one hundred twenty thousand, six hundred fifty-one".