51525250 has 32 divisors (see below), whose sum is σ = 110238336. Its totient is φ = 17665200.

The previous prime is 51525247. The next prime is 51525269. The reversal of 51525250 is 5252515.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 12972 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (3444948).

Almost surely, 2^51525250 is an apocalyptic number.

51525250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51525250 is an abundant number, since it is smaller than the sum of its proper divisors (58713086).

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

51525250 is a wasteful number, since it uses less digits than its factorization.

51525250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29467 (or 29457 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 51525250 is about 7178.1090824813. The cubic root of 51525250 is about 372.1117375444. Note that the first 3 decimals are identical.

Adding to 51525250 its reverse (5252515), we get a palindrome (56777765).

The spelling of 51525250 in words is "fifty-one million, five hundred twenty-five thousand, two hundred fifty".