91555525331 has 2 divisors, whose sum is σ = 91555525332. Its totient is φ = 91555525330.

The previous prime is 91555525307. The next prime is 91555525351. The reversal of 91555525331 is 13352555519.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91555525331 is a prime.

It is a super-2 number, since 2×91555525331² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (91555525301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45777762665 + 45777762666.

It is an arithmetic number, because the mean of its divisors is an integer number (45777762666).

Almost surely, 2^91555525331 is an apocalyptic number.

91555525331 is a deficient number, since it is larger than the sum of its proper divisors (1).

91555525331 is an equidigital number, since it uses as much as digits as its factorization.

91555525331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 506250, while the sum is 44.

The spelling of 91555525331 in words is "ninety-one billion, five hundred fifty-five million, five hundred twenty-five thousand, three hundred thirty-one".