51550237 has 2 divisors, whose sum is σ = 51550238. Its totient is φ = 51550236.

The previous prime is 51550231. The next prime is 51550259. The reversal of 51550237 is 73205515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48288601 + 3261636 = 6949^2 + 1806^2 .

It is a cyclic number.

It is not a de Polignac number, because 51550237 - 2³ = 51550229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51550231) 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, 25775118 + 25775119.

It is an arithmetic number, because the mean of its divisors is an integer number (25775119).

Almost surely, 2^51550237 is an apocalyptic number.

It is an amenable number.

51550237 is a deficient number, since it is larger than the sum of its proper divisors (1).

51550237 is an equidigital number, since it uses as much as digits as its factorization.

51550237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 51550237 is about 7179.8493716790. The cubic root of 51550237 is about 372.1718792768.

The spelling of 51550237 in words is "fifty-one million, five hundred fifty thousand, two hundred thirty-seven".