51515472 has 20 divisors (see below), whose sum is σ = 133081760. Its totient is φ = 17171808.

The previous prime is 51515461. The next prime is 51515473. The reversal of 51515472 is 27451515.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515473) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 536572 + ... + 536667.

It is an arithmetic number, because the mean of its divisors is an integer number (6654088).

Almost surely, 2^51515472 is an apocalyptic number.

It is an amenable number.

51515472 is an abundant number, since it is smaller than the sum of its proper divisors (81566288).

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

51515472 is a wasteful number, since it uses less digits than its factorization.

51515472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073250 (or 1073244 counting only the distinct ones).

The product of its digits is 7000, while the sum is 30.

The square root of 51515472 is about 7177.4279515715. The cubic root of 51515472 is about 372.0881973788.

Adding to 51515472 its reverse (27451515), we get a palindrome (78966987).

The spelling of 51515472 in words is "fifty-one million, five hundred fifteen thousand, four hundred seventy-two".