91568423 has 4 divisors (see below), whose sum is σ = 91624080. Its totient is φ = 91512768.

The previous prime is 91568417. The next prime is 91568437. The reversal of 91568423 is 32486519.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91568423 - 2¹⁸ = 91306279 is a prime.

It is a super-4 number, since 4×91568423⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91568453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25283 + ... + 28676.

It is an arithmetic number, because the mean of its divisors is an integer number (22906020).

Almost surely, 2^91568423 is an apocalyptic number.

91568423 is a deficient number, since it is larger than the sum of its proper divisors (55657).

91568423 is a wasteful number, since it uses less digits than its factorization.

91568423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55656.

The product of its digits is 51840, while the sum is 38.

The square root of 91568423 is about 9569.1390939833. The cubic root of 91568423 is about 450.7287336491.

The spelling of 91568423 in words is "ninety-one million, five hundred sixty-eight thousand, four hundred twenty-three".