51381136 has 20 divisors (see below), whose sum is σ = 102763264. Its totient is φ = 24861600.

The previous prime is 51381133. The next prime is 51381137. The reversal of 51381136 is 63118315.

51381136 is an admirable number.

It is a super-2 number, since 2×51381136² = 5280042273300992, which contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51300 + ... + 52291.

Almost surely, 2^51381136 is an apocalyptic number.

It is an amenable number.

51381136 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51381136 is a wasteful number, since it uses less digits than its factorization.

51381136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103630 (or 103624 counting only the distinct ones).

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

The square root of 51381136 is about 7168.0636157891. The cubic root of 51381136 is about 371.7644865311.

The spelling of 51381136 in words is "fifty-one million, three hundred eighty-one thousand, one hundred thirty-six".