51711817 has 2 divisors, whose sum is σ = 51711818. Its totient is φ = 51711816.

The previous prime is 51711809. The next prime is 51711827. The reversal of 51711817 is 71811715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50965321 + 746496 = 7139^2 + 864^2 .

It is a cyclic number.

It is not a de Polignac number, because 51711817 - 2³ = 51711809 is a prime.

It is a super-2 number, since 2×51711817² = 5348224034882978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51711827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25855908 + 25855909.

It is an arithmetic number, because the mean of its divisors is an integer number (25855909).

Almost surely, 2^51711817 is an apocalyptic number.

It is an amenable number.

51711817 is a deficient number, since it is larger than the sum of its proper divisors (1).

51711817 is an equidigital number, since it uses as much as digits as its factorization.

51711817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 31.

The square root of 51711817 is about 7191.0928932951. The cubic root of 51711817 is about 372.5603211473.

The spelling of 51711817 in words is "fifty-one million, seven hundred eleven thousand, eight hundred seventeen".