51238090 has 16 divisors (see below), whose sum is σ = 92592072. Its totient is φ = 20414464.

The previous prime is 51238039. The next prime is 51238091. The reversal of 51238090 is 9083215.

51238090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 46498761 + 4739329 = 6819^2 + 2177^2 .

It is not an unprimeable number, because it can be changed into a prime (51238091) 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 in 7 ways as a sum of consecutive naturals, for example, 7399 + ... + 12538.

Almost surely, 2^51238090 is an apocalyptic number.

51238090 is a deficient number, since it is larger than the sum of its proper divisors (41353982).

51238090 is a wasteful number, since it uses less digits than its factorization.

51238090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20201.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 51238090 is about 7158.0786528230. The cubic root of 51238090 is about 371.4191662172.

The spelling of 51238090 in words is "fifty-one million, two hundred thirty-eight thousand, ninety".