51565571 has 2 divisors, whose sum is σ = 51565572. Its totient is φ = 51565570.

The previous prime is 51565543. The next prime is 51565589. The reversal of 51565571 is 17556515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51565571 is a prime.

It is a super-2 number, since 2×51565571² = 5318016225112082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51565511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25782785 + 25782786.

It is an arithmetic number, because the mean of its divisors is an integer number (25782786).

Almost surely, 2^51565571 is an apocalyptic number.

51565571 is a deficient number, since it is larger than the sum of its proper divisors (1).

51565571 is an equidigital number, since it uses as much as digits as its factorization.

51565571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26250, while the sum is 35.

The square root of 51565571 is about 7180.9171419812. The cubic root of 51565571 is about 372.2087773796.

The spelling of 51565571 in words is "fifty-one million, five hundred sixty-five thousand, five hundred seventy-one".