51175681 has 2 divisors, whose sum is σ = 51175682. Its totient is φ = 51175680.

The previous prime is 51175613. The next prime is 51175703. The reversal of 51175681 is 18657115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33535681 + 17640000 = 5791^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 51175681 - 2¹⁵ = 51142913 is a prime.

It is a super-2 number, since 2×51175681² = 5237900651627522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51175081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25587840 + 25587841.

It is an arithmetic number, because the mean of its divisors is an integer number (25587841).

Almost surely, 2^51175681 is an apocalyptic number.

It is an amenable number.

51175681 is a deficient number, since it is larger than the sum of its proper divisors (1).

51175681 is an equidigital number, since it uses as much as digits as its factorization.

51175681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 34.

The square root of 51175681 is about 7153.7179843771. The cubic root of 51175681 is about 371.2683063373.

The spelling of 51175681 in words is "fifty-one million, one hundred seventy-five thousand, six hundred eighty-one".