51013800 has 240 divisors, whose sum is σ = 183648960. Its totient is φ = 13115520.

The previous prime is 51013789. The next prime is 51013811. The reversal of 51013800 is 831015.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51013789) and next prime (51013811).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 761367 + ... + 761433.

It is an arithmetic number, because the mean of its divisors is an integer number (765204).

Almost surely, 2^51013800 is an apocalyptic number.

51013800 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 51013800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91824480).

51013800 is an abundant number, since it is smaller than the sum of its proper divisors (132635160).

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

51013800 is a wasteful number, since it uses less digits than its factorization.

51013800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 51013800 is about 7142.3945564495. The cubic root of 51013800 is about 370.8764224924.

Adding to 51013800 its reverse (831015), we get a palindrome (51844815).

The spelling of 51013800 in words is "fifty-one million, thirteen thousand, eight hundred".