51251320 has 16 divisors (see below), whose sum is σ = 115315560. Its totient is φ = 20500512.

The previous prime is 51251287. The next prime is 51251359. The reversal of 51251320 is 2315215.

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, 640602 + ... + 640681.

Almost surely, 2^51251320 is an apocalyptic number.

It is an amenable number.

51251320 is an abundant number, since it is smaller than the sum of its proper divisors (64064240).

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

51251320 is a wasteful number, since it uses less digits than its factorization.

51251320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281294 (or 1281290 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 51251320 is about 7159.0027238436. The cubic root of 51251320 is about 371.4511310614.

Adding to 51251320 its reverse (2315215), we get a palindrome (53566535).

The spelling of 51251320 in words is "fifty-one million, two hundred fifty-one thousand, three hundred twenty".