51251712 has 80 divisors (see below), whose sum is σ = 139029792. Its totient is φ = 16773120.

The previous prime is 51251701. The next prime is 51251731. The reversal of 51251712 is 21715215.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 93423 + ... + 93969.

Almost surely, 2^51251712 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 51251712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69514896).

51251712 is an abundant number, since it is smaller than the sum of its proper divisors (87778080).

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

51251712 is an equidigital number, since it uses as much as digits as its factorization.

51251712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 613 counting only the distinct ones).

The product of its digits is 700, while the sum is 24.

The square root of 51251712 is about 7159.0301019063. The cubic root of 51251712 is about 371.4520780840.

Adding to 51251712 its reverse (21715215), we get a palindrome (72966927).

The spelling of 51251712 in words is "fifty-one million, two hundred fifty-one thousand, seven hundred twelve".