51721282 has 16 divisors (see below), whose sum is σ = 78865920. Its totient is φ = 25435872.

The previous prime is 51721261. The next prime is 51721309. The reversal of 51721282 is 28212715.

It is a self number, because there is not a number n which added to its sum of digits gives 51721282.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39043 + ... + 40345.

It is an arithmetic number, because the mean of its divisors is an integer number (4929120).

Almost surely, 2^51721282 is an apocalyptic number.

51721282 is a deficient number, since it is larger than the sum of its proper divisors (27144638).

51721282 is a wasteful number, since it uses less digits than its factorization.

51721282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617.

The product of its digits is 2240, while the sum is 28.

The square root of 51721282 is about 7191.7509689922. The cubic root of 51721282 is about 372.5830501129.

Adding to 51721282 its reverse (28212715), we get a palindrome (79933997).

It can be divided in two parts, 51721 and 282, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 51721282 in words is "fifty-one million, seven hundred twenty-one thousand, two hundred eighty-two".