51117400 has 24 divisors (see below), whose sum is σ = 118848420. Its totient is φ = 20446880.

The previous prime is 51117397. The next prime is 51117421. The reversal of 51117400 is 471115.

It is a super-2 number, since 2×51117400² = 5225977165520000, 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, 127594 + ... + 127993.

Almost surely, 2^51117400 is an apocalyptic number.

51117400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51117400 is an abundant number, since it is smaller than the sum of its proper divisors (67731020).

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

51117400 is a wasteful number, since it uses less digits than its factorization.

51117400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255603 (or 255594 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 51117400 is about 7149.6433477482. The cubic root of 51117400 is about 371.1273141904.

Adding to 51117400 its reverse (471115), we get a palindrome (51588515).

The spelling of 51117400 in words is "fifty-one million, one hundred seventeen thousand, four hundred".