51331400 has 48 divisors (see below), whose sum is σ = 124545600. Its totient is φ = 19638080.

The previous prime is 51331391. The next prime is 51331411. The reversal of 51331400 is 413315.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 980 + ... + 10179.

It is an arithmetic number, because the mean of its divisors is an integer number (2594700).

Almost surely, 2^51331400 is an apocalyptic number.

51331400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51331400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62272800).

51331400 is an abundant number, since it is smaller than the sum of its proper divisors (73214200).

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

51331400 is a wasteful number, since it uses less digits than its factorization.

51331400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11198 (or 11189 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 51331400 is about 7164.5934985873. The cubic root of 51331400 is about 371.6444940645.

Adding to 51331400 its reverse (413315), we get a palindrome (51744715).

It can be divided in two parts, 513 and 31400, that added together give a palindrome (31913).

The spelling of 51331400 in words is "fifty-one million, three hundred thirty-one thousand, four hundred".