51131867 has 2 divisors, whose sum is σ = 51131868. Its totient is φ = 51131866.

The previous prime is 51131863. The next prime is 51131923. The reversal of 51131867 is 76813115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51131867 - 2² = 51131863 is a prime.

It is a super-2 number, since 2×51131867² = 5228935645811378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51131863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25565933 + 25565934.

It is an arithmetic number, because the mean of its divisors is an integer number (25565934).

Almost surely, 2^51131867 is an apocalyptic number.

51131867 is a deficient number, since it is larger than the sum of its proper divisors (1).

51131867 is an equidigital number, since it uses as much as digits as its factorization.

51131867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 51131867 is about 7150.6550049628. The cubic root of 51131867 is about 371.1623224421.

The spelling of 51131867 in words is "fifty-one million, one hundred thirty-one thousand, eight hundred sixty-seven".