51257923 has 4 divisors (see below), whose sum is σ = 51272928. Its totient is φ = 51242920.

The previous prime is 51257917. The next prime is 51257929. The reversal of 51257923 is 32975215.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (51257917) and next prime (51257929).

It is a cyclic number.

It is not a de Polignac number, because 51257923 - 2⁹ = 51257411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51257929) 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, 390 + ... + 10132.

It is an arithmetic number, because the mean of its divisors is an integer number (12818232).

Almost surely, 2^51257923 is an apocalyptic number.

51257923 is a deficient number, since it is larger than the sum of its proper divisors (15005).

51257923 is an equidigital number, since it uses as much as digits as its factorization.

51257923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15004.

The product of its digits is 18900, while the sum is 34.

The square root of 51257923 is about 7159.4638765762. The cubic root of 51257923 is about 371.4670824327.

The spelling of 51257923 in words is "fifty-one million, two hundred fifty-seven thousand, nine hundred twenty-three".