91040623 has 4 divisors (see below), whose sum is σ = 93261168. Its totient is φ = 88820080.

The previous prime is 91040617. The next prime is 91040641. The reversal of 91040623 is 32604019.

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 91040623 - 2⁹ = 91040111 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 (91040603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110211 + ... + 1110292.

It is an arithmetic number, because the mean of its divisors is an integer number (23315292).

Almost surely, 2^91040623 is an apocalyptic number.

91040623 is a deficient number, since it is larger than the sum of its proper divisors (2220545).

91040623 is a wasteful number, since it uses less digits than its factorization.

91040623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220544.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 91040623 is about 9541.5210003437. The cubic root of 91040623 is about 449.8610649279.

The spelling of 91040623 in words is "ninety-one million, forty thousand, six hundred twenty-three".