23157791 has 4 divisors (see below), whose sum is σ = 24520032. Its totient is φ = 21795552.

The previous prime is 23157773. The next prime is 23157809. The reversal of 23157791 is 19775132.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (23157773) and next prime (23157809).

It is a cyclic number.

It is not a de Polignac number, because 23157791 - 2⁶ = 23157727 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 (23157721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681095 + ... + 681128.

It is an arithmetic number, because the mean of its divisors is an integer number (6130008).

Almost surely, 2^23157791 is an apocalyptic number.

23157791 is a deficient number, since it is larger than the sum of its proper divisors (1362241).

23157791 is a wasteful number, since it uses less digits than its factorization.

23157791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362240.

The product of its digits is 13230, while the sum is 35.

The square root of 23157791 is about 4812.2542534658. The cubic root of 23157791 is about 285.0355593263.

The spelling of 23157791 in words is "twenty-three million, one hundred fifty-seven thousand, seven hundred ninety-one".