51381138 has 32 divisors (see below), whose sum is σ = 105311232. Its totient is φ = 16707600.

The previous prime is 51381137. The next prime is 51381151. The reversal of 51381138 is 83118315.

It is not an unprimeable number, because it can be changed into a prime (51381133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43293 + ... + 44463.

It is an arithmetic number, because the mean of its divisors is an integer number (3290976).

Almost surely, 2^51381138 is an apocalyptic number.

51381138 is an abundant number, since it is smaller than the sum of its proper divisors (53930094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51381138 is a wasteful number, since it uses less digits than its factorization.

51381138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350.

The product of its digits is 2880, while the sum is 30.

The square root of 51381138 is about 7168.0637552968. The cubic root of 51381138 is about 371.7644913547.

The spelling of 51381138 in words is "fifty-one million, three hundred eighty-one thousand, one hundred thirty-eight".