91444423 has 4 divisors (see below), whose sum is σ = 104507920. Its totient is φ = 78380928.

The previous prime is 91444417. The next prime is 91444439. The reversal of 91444423 is 32444419.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91444423 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 (91444403) 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, 6531738 + ... + 6531751.

It is an arithmetic number, because the mean of its divisors is an integer number (26126980).

Almost surely, 2^91444423 is an apocalyptic number.

91444423 is a deficient number, since it is larger than the sum of its proper divisors (13063497).

91444423 is a wasteful number, since it uses less digits than its factorization.

91444423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13063496.

The product of its digits is 13824, while the sum is 31.

The square root of 91444423 is about 9562.6577372611. The cubic root of 91444423 is about 450.5251860044.

The spelling of 91444423 in words is "ninety-one million, four hundred forty-four thousand, four hundred twenty-three".