51431249 has 2 divisors, whose sum is σ = 51431250. Its totient is φ = 51431248.

The previous prime is 51431213. The next prime is 51431257. The reversal of 51431249 is 94213415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 165649 = 7160^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 51431249 - 2¹² = 51427153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51431279) 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, 25715624 + 25715625.

It is an arithmetic number, because the mean of its divisors is an integer number (25715625).

Almost surely, 2^51431249 is an apocalyptic number.

It is an amenable number.

51431249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51431249 is an equidigital number, since it uses as much as digits as its factorization.

51431249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 51431249 is about 7171.5583383251. The cubic root of 51431249 is about 371.8853102525.

The spelling of 51431249 in words is "fifty-one million, four hundred thirty-one thousand, two hundred forty-nine".