91563423 has 8 divisors (see below), whose sum is σ = 139525248. Its totient is φ = 52321944.

The previous prime is 91563421. The next prime is 91563443. The reversal of 91563423 is 32436519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91563423 - 2¹ = 91563421 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91563421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2180061 + ... + 2180102.

It is an arithmetic number, because the mean of its divisors is an integer number (17440656).

Almost surely, 2^91563423 is an apocalyptic number.

91563423 is a deficient number, since it is larger than the sum of its proper divisors (47961825).

91563423 is a wasteful number, since it uses less digits than its factorization.

91563423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360173.

The product of its digits is 19440, while the sum is 33.

The square root of 91563423 is about 9568.8778338946. The cubic root of 91563423 is about 450.7205296394.

The spelling of 91563423 in words is "ninety-one million, five hundred sixty-three thousand, four hundred twenty-three".