51118172 has 18 divisors (see below), whose sum is σ = 104062392. Its totient is φ = 21907704.

The previous prime is 51118159. The next prime is 51118211. The reversal of 51118172 is 27181115.

It is a super-2 number, since 2×51118172² = 5226135017243168, 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, 130208 + ... + 130599.

It is an arithmetic number, because the mean of its divisors is an integer number (5781244).

Almost surely, 2^51118172 is an apocalyptic number.

It is an amenable number.

51118172 is an abundant number, since it is smaller than the sum of its proper divisors (52944220).

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

51118172 is a wasteful number, since it uses less digits than its factorization.

51118172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260825 (or 260816 counting only the distinct ones).

The product of its digits is 560, while the sum is 26.

The square root of 51118172 is about 7149.6973362514. The cubic root of 51118172 is about 371.1291824964.

Adding to 51118172 its reverse (27181115), we get a palindrome (78299287).

The spelling of 51118172 in words is "fifty-one million, one hundred eighteen thousand, one hundred seventy-two".