51631901 has 2 divisors, whose sum is σ = 51631902. Its totient is φ = 51631900.

The previous prime is 51631871. The next prime is 51631961. The reversal of 51631901 is 10913615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 14055001 = 6130^2 + 3749^2 .

It is a cyclic number.

It is not a de Polignac number, because 51631901 - 2¹⁸ = 51369757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51631961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25815950 + 25815951.

It is an arithmetic number, because the mean of its divisors is an integer number (25815951).

Almost surely, 2^51631901 is an apocalyptic number.

It is an amenable number.

51631901 is a deficient number, since it is larger than the sum of its proper divisors (1).

51631901 is an equidigital number, since it uses as much as digits as its factorization.

51631901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 51631901 is about 7185.5341485515. The cubic root of 51631901 is about 372.3683026173.

The spelling of 51631901 in words is "fifty-one million, six hundred thirty-one thousand, nine hundred one".