91261723 has 16 divisors (see below), whose sum is σ = 109241856. Its totient is φ = 74543040.

The previous prime is 91261717. The next prime is 91261727. The reversal of 91261723 is 32716219.

It is a cyclic number.

It is not a de Polignac number, because 91261723 - 2⁹ = 91261211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91261727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49488 + ... + 51298.

It is an arithmetic number, because the mean of its divisors is an integer number (6827616).

Almost surely, 2^91261723 is an apocalyptic number.

91261723 is a deficient number, since it is larger than the sum of its proper divisors (17980133).

91261723 is a wasteful number, since it uses less digits than its factorization.

91261723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154.

The product of its digits is 4536, while the sum is 31.

The square root of 91261723 is about 9553.1001774293. The cubic root of 91261723 is about 450.2249459715.

The spelling of 91261723 in words is "ninety-one million, two hundred sixty-one thousand, seven hundred twenty-three".