91551423 has 16 divisors (see below), whose sum is σ = 124710272. Its totient is φ = 59724000.

The previous prime is 91551419. The next prime is 91551433. The reversal of 91551423 is 32415519.

It is not a de Polignac number, because 91551423 - 2² = 91551419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91551433) 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 in 15 ways as a sum of consecutive naturals, for example, 37428 + ... + 39798.

It is an arithmetic number, because the mean of its divisors is an integer number (7794392).

Almost surely, 2^91551423 is an apocalyptic number.

91551423 is a deficient number, since it is larger than the sum of its proper divisors (33158849).

91551423 is a wasteful number, since it uses less digits than its factorization.

91551423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646.

The product of its digits is 5400, while the sum is 30.

The square root of 91551423 is about 9568.2507805764. The cubic root of 91551423 is about 450.7008387975.

The spelling of 91551423 in words is "ninety-one million, five hundred fifty-one thousand, four hundred twenty-three".