51431663 has 2 divisors, whose sum is σ = 51431664. Its totient is φ = 51431662.

The previous prime is 51431629. The next prime is 51431687. The reversal of 51431663 is 36613415.

It is a happy number.

51431663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51431663 - 2⁸ = 51431407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51431363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25715831 + 25715832.

It is an arithmetic number, because the mean of its divisors is an integer number (25715832).

Almost surely, 2^51431663 is an apocalyptic number.

51431663 is a deficient number, since it is larger than the sum of its proper divisors (1).

51431663 is an equidigital number, since it uses as much as digits as its factorization.

51431663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 51431663 is about 7171.5872022865. The cubic root of 51431663 is about 371.8863080901.

The spelling of 51431663 in words is "fifty-one million, four hundred thirty-one thousand, six hundred sixty-three".