51313420 has 12 divisors (see below), whose sum is σ = 107758224. Its totient is φ = 20525360.

The previous prime is 51313417. The next prime is 51313439. The reversal of 51313420 is 2431315.

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, 1282816 + ... + 1282855.

It is an arithmetic number, because the mean of its divisors is an integer number (8979852).

Almost surely, 2^51313420 is an apocalyptic number.

It is an amenable number.

51313420 is an abundant number, since it is smaller than the sum of its proper divisors (56444804).

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

51313420 is a wasteful number, since it uses less digits than its factorization.

51313420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565680 (or 2565678 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51313420 is about 7163.3386071021. The cubic root of 51313420 is about 371.6010966615.

Adding to 51313420 its reverse (2431315), we get a palindrome (53744735).

The spelling of 51313420 in words is "fifty-one million, three hundred thirteen thousand, four hundred twenty".