51513384 has 64 divisors (see below), whose sum is σ = 142107840. Its totient is φ = 15459840.

The previous prime is 51513377. The next prime is 51513391. The reversal of 51513384 is 48331515.

It is an interprime number because it is at equal distance from previous prime (51513377) and next prime (51513391).

It is a super-2 number, since 2×51513384² = 5307257462262912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10779 + ... + 14805.

It is an arithmetic number, because the mean of its divisors is an integer number (2220435).

Almost surely, 2^51513384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51513384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71053920).

51513384 is an abundant number, since it is smaller than the sum of its proper divisors (90594456).

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

51513384 is a wasteful number, since it uses less digits than its factorization.

51513384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090 (or 4086 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 51513384 is about 7177.2824940920. The cubic root of 51513384 is about 372.0831702117.

Adding to 51513384 its reverse (48331515), we get a palindrome (99844899).

The spelling of 51513384 in words is "fifty-one million, five hundred thirteen thousand, three hundred eighty-four".