23121791 has 16 divisors (see below), whose sum is σ = 29445120. Its totient is φ = 17630880.

The previous prime is 23121773. The next prime is 23121797. The reversal of 23121791 is 19712132.

It is a cyclic number.

It is not a de Polignac number, because 23121791 - 2¹⁸ = 22859647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23121791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425 + ... + 6813.

It is an arithmetic number, because the mean of its divisors is an integer number (1840320).

Almost surely, 2^23121791 is an apocalyptic number.

23121791 is a deficient number, since it is larger than the sum of its proper divisors (6323329).

23121791 is a wasteful number, since it uses less digits than its factorization.

23121791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6454.

The product of its digits is 756, while the sum is 26.

The square root of 23121791 is about 4808.5123479097. The cubic root of 23121791 is about 284.8877818179.

It can be divided in two parts, 231 and 21791, that added together give a palindrome (22022).

The spelling of 23121791 in words is "twenty-three million, one hundred twenty-one thousand, seven hundred ninety-one".