91251923 has 16 divisors (see below), whose sum is σ = 106928640. Its totient is φ = 76260096.

The previous prime is 91251911. The next prime is 91251929. The reversal of 91251923 is 32915219.

It is a cyclic number.

It is not a de Polignac number, because 91251923 - 2²⁶ = 24143059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91251923.

It is not an unprimeable number, because it can be changed into a prime (91251929) 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, 47363 + ... + 49251.

It is an arithmetic number, because the mean of its divisors is an integer number (6683040).

Almost surely, 2^91251923 is an apocalyptic number.

91251923 is a deficient number, since it is larger than the sum of its proper divisors (15676717).

91251923 is a wasteful number, since it uses less digits than its factorization.

91251923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066.

The product of its digits is 4860, while the sum is 32.

The square root of 91251923 is about 9552.5872411614. The cubic root of 91251923 is about 450.2088298231.

The spelling of 91251923 in words is "ninety-one million, two hundred fifty-one thousand, nine hundred twenty-three".