51131923 has 2 divisors, whose sum is σ = 51131924. Its totient is φ = 51131922.

The previous prime is 51131867. The next prime is 51131933. The reversal of 51131923 is 32913115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51131923 - 2⁹ = 51131411 is a prime.

It is a super-2 number, since 2×51131923² = 5228947099355858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51131933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25565961 + 25565962.

It is an arithmetic number, because the mean of its divisors is an integer number (25565962).

Almost surely, 2^51131923 is an apocalyptic number.

51131923 is a deficient number, since it is larger than the sum of its proper divisors (1).

51131923 is an equidigital number, since it uses as much as digits as its factorization.

51131923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 25.

The square root of 51131923 is about 7150.6589206870. The cubic root of 51131923 is about 371.1624579420.

The spelling of 51131923 in words is "fifty-one million, one hundred thirty-one thousand, nine hundred twenty-three".