51021569 has 2 divisors, whose sum is σ = 51021570. Its totient is φ = 51021568.

The previous prime is 51021533. The next prime is 51021577. The reversal of 51021569 is 96512015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 15499969 = 5960^2 + 3937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51021569 is a prime.

It is a super-2 number, since 2×51021569² = 5206401006443522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51021599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510784 + 25510785.

It is an arithmetic number, because the mean of its divisors is an integer number (25510785).

Almost surely, 2^51021569 is an apocalyptic number.

It is an amenable number.

51021569 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021569 is an equidigital number, since it uses as much as digits as its factorization.

51021569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 51021569 is about 7142.9384009664. The cubic root of 51021569 is about 370.8952487229.

The spelling of 51021569 in words is "fifty-one million, twenty-one thousand, five hundred sixty-nine".