51431629 has 2 divisors, whose sum is σ = 51431630. Its totient is φ = 51431628.

The previous prime is 51431563. The next prime is 51431663. The reversal of 51431629 is 92613415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28869129 + 22562500 = 5373^2 + 4750^2 .

It is a cyclic number.

It is not a de Polignac number, because 51431629 - 2¹⁹ = 50907341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51431629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51431329) 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, 25715814 + 25715815.

It is an arithmetic number, because the mean of its divisors is an integer number (25715815).

Almost surely, 2^51431629 is an apocalyptic number.

It is an amenable number.

51431629 is a deficient number, since it is larger than the sum of its proper divisors (1).

51431629 is an equidigital number, since it uses as much as digits as its factorization.

51431629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 51431629 is about 7171.5848318206. The cubic root of 51431629 is about 371.8862261423.

The spelling of 51431629 in words is "fifty-one million, four hundred thirty-one thousand, six hundred twenty-nine".