51125100 has 72 divisors (see below), whose sum is σ = 159312720. Its totient is φ = 12583680.

The previous prime is 51125077. The next prime is 51125117. The reversal of 51125100 is 152115.

It is a super-2 number, since 2×51125100² = 5227551700020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51125100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2655 + ... + 10454.

Almost surely, 2^51125100 is an apocalyptic number.

51125100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51125100 is an abundant number, since it is smaller than the sum of its proper divisors (108187620).

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

51125100 is a wasteful number, since it uses less digits than its factorization.

51125100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13139 (or 13132 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 51125100 is about 7150.1818158701. The cubic root of 51125100 is about 371.1459480074.

Adding to 51125100 its reverse (152115), we get a palindrome (51277215).

The spelling of 51125100 in words is "fifty-one million, one hundred twenty-five thousand, one hundred".