51121684 has 12 divisors (see below), whose sum is σ = 89964000. Its totient is φ = 25417688.

The previous prime is 51121657. The next prime is 51121717. The reversal of 51121684 is 48612115.

It is a super-2 number, since 2×51121684² = 5226853149991712, 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 3 ways as a sum of consecutive naturals, for example, 34984 + ... + 36415.

It is an arithmetic number, because the mean of its divisors is an integer number (7497000).

Almost surely, 2^51121684 is an apocalyptic number.

It is an amenable number.

51121684 is a deficient number, since it is larger than the sum of its proper divisors (38842316).

51121684 is a wasteful number, since it uses less digits than its factorization.

51121684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71582 (or 71580 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 51121684 is about 7149.9429368352. The cubic root of 51121684 is about 371.1376815995.

Adding to 51121684 its reverse (48612115), we get a palindrome (99733799).

The spelling of 51121684 in words is "fifty-one million, one hundred twenty-one thousand, six hundred eighty-four".