91564151927 has 2 divisors, whose sum is σ = 91564151928. Its totient is φ = 91564151926.

The previous prime is 91564151881. The next prime is 91564151999. The reversal of 91564151927 is 72915146519.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91564151927 - 2²⁶ = 91497043063 is a prime.

It is a super-2 number, since 2×91564151927² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91564121927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45782075963 + 45782075964.

It is an arithmetic number, because the mean of its divisors is an integer number (45782075964).

Almost surely, 2^91564151927 is an apocalyptic number.

91564151927 is a deficient number, since it is larger than the sum of its proper divisors (1).

91564151927 is an equidigital number, since it uses as much as digits as its factorization.

91564151927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The spelling of 91564151927 in words is "ninety-one billion, five hundred sixty-four million, one hundred fifty-one thousand, nine hundred twenty-seven".