51431769 has 6 divisors (see below), whose sum is σ = 74290346. Its totient is φ = 34287840.

The previous prime is 51431719. The next prime is 51431789. The reversal of 51431769 is 96713415.

It can be written as a sum of positive squares in only one way, i.e., 38900169 + 12531600 = 6237^2 + 3540^2 .

It is not a de Polignac number, because 51431769 - 2⁹ = 51431257 is a prime.

It is a super-2 number, since 2×51431769² = 5290453724938722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51431719) 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 in 5 ways as a sum of consecutive naturals, for example, 2857312 + ... + 2857329.

Almost surely, 2^51431769 is an apocalyptic number.

It is an amenable number.

51431769 is a deficient number, since it is larger than the sum of its proper divisors (22858577).

51431769 is a wasteful number, since it uses less digits than its factorization.

51431769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5714647 (or 5714644 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 51431769 is about 7171.5945925575. The cubic root of 51431769 is about 371.8865635742.

The spelling of 51431769 in words is "fifty-one million, four hundred thirty-one thousand, seven hundred sixty-nine".