51001400 has 24 divisors (see below), whose sum is σ = 118578720. Its totient is φ = 20400480.

The previous prime is 51001381. The next prime is 51001421. The reversal of 51001400 is 410015.

It is a super-2 number, since 2×51001400² = 5202285603920000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127304 + ... + 127703.

It is an arithmetic number, because the mean of its divisors is an integer number (4940780).

Almost surely, 2^51001400 is an apocalyptic number.

51001400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51001400 is an abundant number, since it is smaller than the sum of its proper divisors (67577320).

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

51001400 is a wasteful number, since it uses less digits than its factorization.

51001400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255023 (or 255014 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 51001400 is about 7141.5264474761. The cubic root of 51001400 is about 370.8463702300.

Adding to 51001400 its reverse (410015), we get a palindrome (51411415).

The spelling of 51001400 in words is "fifty-one million, one thousand, four hundred".