51440737 has 2 divisors, whose sum is σ = 51440738. Its totient is φ = 51440736.

The previous prime is 51440731. The next prime is 51440777. The reversal of 51440737 is 73704415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33454656 + 17986081 = 5784^2 + 4241^2 .

It is a cyclic number.

It is not a de Polignac number, because 51440737 - 2³ = 51440729 is a prime.

It is a super-2 number, since 2×51440737² = 5292298846206338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51440699 and 51440708.

It is not a weakly prime, because it can be changed into another prime (51440731) 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, 25720368 + 25720369.

It is an arithmetic number, because the mean of its divisors is an integer number (25720369).

Almost surely, 2^51440737 is an apocalyptic number.

It is an amenable number.

51440737 is a deficient number, since it is larger than the sum of its proper divisors (1).

51440737 is an equidigital number, since it uses as much as digits as its factorization.

51440737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 51440737 is about 7172.2198097939. The cubic root of 51440737 is about 371.9081772250.

The spelling of 51440737 in words is "fifty-one million, four hundred forty thousand, seven hundred thirty-seven".