91723631 has 2 divisors, whose sum is σ = 91723632. Its totient is φ = 91723630.

The previous prime is 91723627. The next prime is 91723651. The reversal of 91723631 is 13632719.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91723631 - 2² = 91723627 is a prime.

It is a super-2 number, since 2×91723631² = 16826448967648322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91723651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45861815 + 45861816.

It is an arithmetic number, because the mean of its divisors is an integer number (45861816).

Almost surely, 2^91723631 is an apocalyptic number.

91723631 is a deficient number, since it is larger than the sum of its proper divisors (1).

91723631 is an equidigital number, since it uses as much as digits as its factorization.

91723631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 32.

The square root of 91723631 is about 9577.2454808259. The cubic root of 91723631 is about 450.9832508533.

The spelling of 91723631 in words is "ninety-one million, seven hundred twenty-three thousand, six hundred thirty-one".