51252500 has 120 divisors (see below), whose sum is σ = 128583840. Its totient is φ = 17712000.

The previous prime is 51252469. The next prime is 51252527. The reversal of 51252500 is 525215.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 617459 + ... + 617541.

It is an arithmetic number, because the mean of its divisors is an integer number (1071532).

Almost surely, 2^51252500 is an apocalyptic number.

51252500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51252500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64291920).

51252500 is an abundant number, since it is smaller than the sum of its proper divisors (77331340).

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

51252500 is a wasteful number, since it uses less digits than its factorization.

51252500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 51252500 is about 7159.0851370828. The cubic root of 51252500 is about 371.4539817781.

Adding to 51252500 its reverse (525215), we get a palindrome (51777715).

The spelling of 51252500 in words is "fifty-one million, two hundred fifty-two thousand, five hundred".