51245569 has 2 divisors, whose sum is σ = 51245570. Its totient is φ = 51245568.

The previous prime is 51245563. The next prime is 51245591. The reversal of 51245569 is 96554215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43890625 + 7354944 = 6625^2 + 2712^2 .

It is a cyclic number.

It is not a de Polignac number, because 51245569 - 2³ = 51245561 is a prime.

It is a super-2 number, since 2×51245569² = 5252216684267522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51245561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25622784 + 25622785.

It is an arithmetic number, because the mean of its divisors is an integer number (25622785).

Almost surely, 2^51245569 is an apocalyptic number.

It is an amenable number.

51245569 is a deficient number, since it is larger than the sum of its proper divisors (1).

51245569 is an equidigital number, since it uses as much as digits as its factorization.

51245569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

The square root of 51245569 is about 7158.6010504847. The cubic root of 51245569 is about 371.4372368153.

The spelling of 51245569 in words is "fifty-one million, two hundred forty-five thousand, five hundred sixty-nine".