91791623 has 8 divisors (see below), whose sum is σ = 114441600. Its totient is φ = 71525880.

The previous prime is 91791617. The next prime is 91791629. The reversal of 91791623 is 32619719.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91791617) and next prime (91791629).

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

It is a cyclic number.

It is not a de Polignac number, because 91791623 - 2⁴ = 91791607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91791629) 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, 595973 + ... + 596126.

It is an arithmetic number, because the mean of its divisors is an integer number (14305200).

Almost surely, 2^91791623 is an apocalyptic number.

91791623 is a deficient number, since it is larger than the sum of its proper divisors (22649977).

91791623 is a wasteful number, since it uses less digits than its factorization.

91791623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192117.

The product of its digits is 20412, while the sum is 38.

The square root of 91791623 is about 9580.7944868889. The cubic root of 91791623 is about 451.0946568214.

The spelling of 91791623 in words is "ninety-one million, seven hundred ninety-one thousand, six hundred twenty-three".