51256511 has 2 divisors, whose sum is σ = 51256512. Its totient is φ = 51256510.

The previous prime is 51256483. The next prime is 51256529. The reversal of 51256511 is 11565215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51256511 - 2¹⁸ = 50994367 is a prime.

It is a Sophie Germain prime.

It is equal to p_3071906 and since 51256511 and 3071906 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51256571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25628255 + 25628256.

It is an arithmetic number, because the mean of its divisors is an integer number (25628256).

Almost surely, 2^51256511 is an apocalyptic number.

51256511 is a deficient number, since it is larger than the sum of its proper divisors (1).

51256511 is an equidigital number, since it uses as much as digits as its factorization.

51256511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 26.

The square root of 51256511 is about 7159.3652651614. The cubic root of 51256511 is about 371.4636714716.

The spelling of 51256511 in words is "fifty-one million, two hundred fifty-six thousand, five hundred eleven".