51390569 has 2 divisors, whose sum is σ = 51390570. Its totient is φ = 51390568.

The previous prime is 51390433. The next prime is 51390583. The reversal of 51390569 is 96509315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29300569 + 22090000 = 5413^2 + 4700^2 .

It is a cyclic number.

It is not a de Polignac number, because 51390569 - 2¹² = 51386473 is a prime.

It is a super-2 number, since 2×51390569² = 5281981164287522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51300569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25695284 + 25695285.

It is an arithmetic number, because the mean of its divisors is an integer number (25695285).

Almost surely, 2^51390569 is an apocalyptic number.

It is an amenable number.

51390569 is a deficient number, since it is larger than the sum of its proper divisors (1).

51390569 is an equidigital number, since it uses as much as digits as its factorization.

51390569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 51390569 is about 7168.7215736141. The cubic root of 51390569 is about 371.7872357350.

The spelling of 51390569 in words is "fifty-one million, three hundred ninety thousand, five hundred sixty-nine".