91723651 has 2 divisors, whose sum is σ = 91723652. Its totient is φ = 91723650.

The previous prime is 91723631. The next prime is 91723729. The reversal of 91723651 is 15632719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91723651 - 2⁹ = 91723139 is a prime.

It is not a weakly prime, because it can be changed into another prime (91723631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45861825 + 45861826.

It is an arithmetic number, because the mean of its divisors is an integer number (45861826).

Almost surely, 2^91723651 is an apocalyptic number.

91723651 is a deficient number, since it is larger than the sum of its proper divisors (1).

91723651 is an equidigital number, since it uses as much as digits as its factorization.

91723651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 91723651 is about 9577.2465249674. The cubic root of 91723651 is about 450.9832836317.

The spelling of 91723651 in words is "ninety-one million, seven hundred twenty-three thousand, six hundred fifty-one".