51717761 has 2 divisors, whose sum is σ = 51717762. Its totient is φ = 51717760.

The previous prime is 51717713. The next prime is 51717763. The reversal of 51717761 is 16771715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49843600 + 1874161 = 7060^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 51717761 - 2⁶ = 51717697 is a prime.

Together with 51717763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51717763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25858880 + 25858881.

It is an arithmetic number, because the mean of its divisors is an integer number (25858881).

Almost surely, 2^51717761 is an apocalyptic number.

It is an amenable number.

51717761 is a deficient number, since it is larger than the sum of its proper divisors (1).

51717761 is an equidigital number, since it uses as much as digits as its factorization.

51717761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10290, while the sum is 35.

The square root of 51717761 is about 7191.5061704764. The cubic root of 51717761 is about 372.5745952136.

The spelling of 51717761 in words is "fifty-one million, seven hundred seventeen thousand, seven hundred sixty-one".