91332212891 has 2 divisors, whose sum is σ = 91332212892. Its totient is φ = 91332212890.

The previous prime is 91332212857. The next prime is 91332212911. The reversal of 91332212891 is 19821223319.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91332212891 is a prime.

It is a super-2 number, since 2×91332212891² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91332212801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45666106445 + 45666106446.

It is an arithmetic number, because the mean of its divisors is an integer number (45666106446).

Almost surely, 2^91332212891 is an apocalyptic number.

91332212891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91332212891 is an equidigital number, since it uses as much as digits as its factorization.

91332212891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The spelling of 91332212891 in words is "ninety-one billion, three hundred thirty-two million, two hundred twelve thousand, eight hundred ninety-one".