51440237 has 2 divisors, whose sum is σ = 51440238. Its totient is φ = 51440236.

The previous prime is 51440203. The next prime is 51440251. The reversal of 51440237 is 73204415.

51440237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25745476 + 25694761 = 5074^2 + 5069^2 .

It is a cyclic number.

It is not a de Polignac number, because 51440237 - 2⁶ = 51440173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51440437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25720118 + 25720119.

It is an arithmetic number, because the mean of its divisors is an integer number (25720119).

Almost surely, 2^51440237 is an apocalyptic number.

It is an amenable number.

51440237 is a deficient number, since it is larger than the sum of its proper divisors (1).

51440237 is an equidigital number, since it uses as much as digits as its factorization.

51440237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 51440237 is about 7172.1849529972. The cubic root of 51440237 is about 371.9069722481.

The spelling of 51440237 in words is "fifty-one million, four hundred forty thousand, two hundred thirty-seven".