51396769 has 2 divisors, whose sum is σ = 51396770. Its totient is φ = 51396768.

The previous prime is 51396757. The next prime is 51396809. The reversal of 51396769 is 96769315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51051025 + 345744 = 7145^2 + 588^2 .

It is a cyclic number.

It is not a de Polignac number, because 51396769 - 2⁷ = 51396641 is a prime.

It is a super-2 number, since 2×51396769² = 5283255727278722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51396269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25698384 + 25698385.

It is an arithmetic number, because the mean of its divisors is an integer number (25698385).

Almost surely, 2^51396769 is an apocalyptic number.

It is an amenable number.

51396769 is a deficient number, since it is larger than the sum of its proper divisors (1).

51396769 is an equidigital number, since it uses as much as digits as its factorization.

51396769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 46.

The square root of 51396769 is about 7169.1539947193. The cubic root of 51396769 is about 371.8021865208.

The spelling of 51396769 in words is "fifty-one million, three hundred ninety-six thousand, seven hundred sixty-nine".