51215552 has 14 divisors (see below), whose sum is σ = 101630988. Its totient is φ = 25607744.

The previous prime is 51215551. The next prime is 51215561. The reversal of 51215552 is 25551215.

It is not an unprimeable number, because it can be changed into a prime (51215551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400058 + ... + 400185.

Almost surely, 2^51215552 is an apocalyptic number.

It is an amenable number.

51215552 is a deficient number, since it is larger than the sum of its proper divisors (50415436).

51215552 is an equidigital number, since it uses as much as digits as its factorization.

51215552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800255 (or 800245 counting only the distinct ones).

The product of its digits is 2500, while the sum is 26.

The square root of 51215552 is about 7156.5041745254. The cubic root of 51215552 is about 371.3646997525.

Adding to 51215552 its reverse (25551215), we get a palindrome (76766767).

It can be divided in two parts, 512 and 15552, that multiplied together give a 5-th power (7962624 = 24⁵).

The spelling of 51215552 in words is "fifty-one million, two hundred fifteen thousand, five hundred fifty-two".