91279723 has 2 divisors, whose sum is σ = 91279724. Its totient is φ = 91279722.

The previous prime is 91279697. The next prime is 91279763. The reversal of 91279723 is 32797219.

It is an a-pointer prime, because the next prime (91279763) can be obtained adding 91279723 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91279723 - 2⁵ = 91279691 is a prime.

It is not a weakly prime, because it can be changed into another prime (91279763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45639861 + 45639862.

It is an arithmetic number, because the mean of its divisors is an integer number (45639862).

Almost surely, 2^91279723 is an apocalyptic number.

91279723 is a deficient number, since it is larger than the sum of its proper divisors (1).

91279723 is an equidigital number, since it uses as much as digits as its factorization.

91279723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 40.

The square root of 91279723 is about 9554.0422335261. The cubic root of 91279723 is about 450.2545440550.

The spelling of 91279723 in words is "ninety-one million, two hundred seventy-nine thousand, seven hundred twenty-three".