51645131 has 2 divisors, whose sum is σ = 51645132. Its totient is φ = 51645130.

The previous prime is 51645109. The next prime is 51645137. The reversal of 51645131 is 13154615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51645131 - 2¹⁰ = 51644107 is a prime.

It is a super-2 number, since 2×51645131² = 5334439112014322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51645131.

It is not a weakly prime, because it can be changed into another prime (51645137) 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, 25822565 + 25822566.

It is an arithmetic number, because the mean of its divisors is an integer number (25822566).

Almost surely, 2^51645131 is an apocalyptic number.

51645131 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645131 is an equidigital number, since it uses as much as digits as its factorization.

51645131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 51645131 is about 7186.4546892052. The cubic root of 51645131 is about 372.4001047386.

Adding to 51645131 its reverse (13154615), we get a palindrome (64799746).

The spelling of 51645131 in words is "fifty-one million, six hundred forty-five thousand, one hundred thirty-one".