51644231 has 2 divisors, whose sum is σ = 51644232. Its totient is φ = 51644230.

The previous prime is 51644221. The next prime is 51644251. The reversal of 51644231 is 13244615.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51644231 is a prime.

It is a super-2 number, since 2×51644231² = 5334253191162722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51644231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51644221) 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, 25822115 + 25822116.

It is an arithmetic number, because the mean of its divisors is an integer number (25822116).

Almost surely, 2^51644231 is an apocalyptic number.

51644231 is a deficient number, since it is larger than the sum of its proper divisors (1).

51644231 is an equidigital number, since it uses as much as digits as its factorization.

51644231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

The square root of 51644231 is about 7186.3920711300. The cubic root of 51644231 is about 372.3979415011.

Adding to 51644231 its reverse (13244615), we get a palindrome (64888846).

The spelling of 51644231 in words is "fifty-one million, six hundred forty-four thousand, two hundred thirty-one".