51681324 has 12 divisors (see below), whose sum is σ = 120589784. Its totient is φ = 17227104.

The previous prime is 51681293. The next prime is 51681337. The reversal of 51681324 is 42318615.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 51681291 and 51681300.

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, 2153377 + ... + 2153400.

Almost surely, 2^51681324 is an apocalyptic number.

It is an amenable number.

51681324 is an abundant number, since it is smaller than the sum of its proper divisors (68908460).

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

51681324 is a wasteful number, since it uses less digits than its factorization.

51681324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306784 (or 4306782 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 51681324 is about 7188.9723883181. The cubic root of 51681324 is about 372.4870773110.

Adding to 51681324 its reverse (42318615), we get a palindrome (93999939).

The spelling of 51681324 in words is "fifty-one million, six hundred eighty-one thousand, three hundred twenty-four".