51512129 has 2 divisors, whose sum is σ = 51512130. Its totient is φ = 51512128.

The previous prime is 51512119. The next prime is 51512147. The reversal of 51512129 is 92121515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44249104 + 7263025 = 6652^2 + 2695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51512129 is a prime.

It is a super-2 number, since 2×51512129² = 5306998868225282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51512098 and 51512107.

It is not a weakly prime, because it can be changed into another prime (51512119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756064 + 25756065.

It is an arithmetic number, because the mean of its divisors is an integer number (25756065).

Almost surely, 2^51512129 is an apocalyptic number.

It is an amenable number.

51512129 is a deficient number, since it is larger than the sum of its proper divisors (1).

51512129 is an equidigital number, since it uses as much as digits as its factorization.

51512129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 26.

The square root of 51512129 is about 7177.1950649261. The cubic root of 51512129 is about 372.0801485493.

The spelling of 51512129 in words is "fifty-one million, five hundred twelve thousand, one hundred twenty-nine".