51515250 has 32 divisors (see below), whose sum is σ = 128583936. Its totient is φ = 13737200.

The previous prime is 51515249. The next prime is 51515279. The reversal of 51515250 is 5251515.

It is a self number, because there is not a number n which added to its sum of digits gives 51515250.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33594 + ... + 35093.

It is an arithmetic number, because the mean of its divisors is an integer number (4018248).

Almost surely, 2^51515250 is an apocalyptic number.

51515250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51515250 is an abundant number, since it is smaller than the sum of its proper divisors (77068686).

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

51515250 is a wasteful number, since it uses less digits than its factorization.

51515250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68707 (or 68697 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 51515250 is about 7177.4124864048. The cubic root of 51515250 is about 372.0876628876.

Adding to 51515250 its reverse (5251515), we get a palindrome (56766765).

It can be divided in two parts, 5151 and 5250, that added together give a palindrome (10401).

The spelling of 51515250 in words is "fifty-one million, five hundred fifteen thousand, two hundred fifty".