51865577 has 2 divisors, whose sum is σ = 51865578. Its totient is φ = 51865576.

The previous prime is 51865553. The next prime is 51865591. The reversal of 51865577 is 77556815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44142736 + 7722841 = 6644^2 + 2779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51865577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51865507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25932788 + 25932789.

It is an arithmetic number, because the mean of its divisors is an integer number (25932789).

Almost surely, 2^51865577 is an apocalyptic number.

It is an amenable number.

51865577 is a deficient number, since it is larger than the sum of its proper divisors (1).

51865577 is an equidigital number, since it uses as much as digits as its factorization.

51865577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294000, while the sum is 44.

The square root of 51865577 is about 7201.7759615250. The cubic root of 51865577 is about 372.9292129205.

The spelling of 51865577 in words is "fifty-one million, eight hundred sixty-five thousand, five hundred seventy-seven".