51694129 has 2 divisors, whose sum is σ = 51694130. Its totient is φ = 51694128.

The previous prime is 51694099. The next prime is 51694163. The reversal of 51694129 is 92149615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49322529 + 2371600 = 7023^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 51694129 - 2¹⁹ = 51169841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51694189) 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, 25847064 + 25847065.

It is an arithmetic number, because the mean of its divisors is an integer number (25847065).

Almost surely, 2^51694129 is an apocalyptic number.

It is an amenable number.

51694129 is a deficient number, since it is larger than the sum of its proper divisors (1).

51694129 is an equidigital number, since it uses as much as digits as its factorization.

51694129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 51694129 is about 7189.8629333249. The cubic root of 51694129 is about 372.5178382821.

The spelling of 51694129 in words is "fifty-one million, six hundred ninety-four thousand, one hundred twenty-nine".