51579917 has 2 divisors, whose sum is σ = 51579918. Its totient is φ = 51579916.

The previous prime is 51579911. The next prime is 51579929. The reversal of 51579917 is 71997515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45981961 + 5597956 = 6781^2 + 2366^2 .

It is a cyclic number.

It is not a de Polignac number, because 51579917 - 2¹⁰ = 51578893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51579911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25789958 + 25789959.

It is an arithmetic number, because the mean of its divisors is an integer number (25789959).

Almost surely, 2^51579917 is an apocalyptic number.

It is an amenable number.

51579917 is a deficient number, since it is larger than the sum of its proper divisors (1).

51579917 is an equidigital number, since it uses as much as digits as its factorization.

51579917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99225, while the sum is 44.

The square root of 51579917 is about 7181.9159699902. The cubic root of 51579917 is about 372.2432914420.

The spelling of 51579917 in words is "fifty-one million, five hundred seventy-nine thousand, nine hundred seventeen".