51561673 has 2 divisors, whose sum is σ = 51561674. Its totient is φ = 51561672.

The previous prime is 51561637. The next prime is 51561701. The reversal of 51561673 is 37616515.

Together with previous prime (51561637) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48274704 + 3286969 = 6948^2 + 1813^2 .

It is a cyclic number.

It is not a de Polignac number, because 51561673 - 2⁹ = 51561161 is a prime.

It is a super-2 number, since 2×51561673² = 5317212245117858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51561613) 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, 25780836 + 25780837.

It is an arithmetic number, because the mean of its divisors is an integer number (25780837).

Almost surely, 2^51561673 is an apocalyptic number.

It is an amenable number.

51561673 is a deficient number, since it is larger than the sum of its proper divisors (1).

51561673 is an equidigital number, since it uses as much as digits as its factorization.

51561673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 34.

The square root of 51561673 is about 7180.6457230530. The cubic root of 51561673 is about 372.1993983414.

The spelling of 51561673 in words is "fifty-one million, five hundred sixty-one thousand, six hundred seventy-three".