51800725 has 6 divisors (see below), whose sum is σ = 64232930. Its totient is φ = 41440560.

The previous prime is 51800689. The next prime is 51800731. The reversal of 51800725 is 52700815.

51800725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 47089 + 51753636 = 217^2 + 7194^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51800725 is a prime.

It is a super-2 number, since 2×51800725² = 5366630221051250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51800693 and 51800702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1035990 + ... + 1036039.

Almost surely, 2^51800725 is an apocalyptic number.

It is an amenable number.

51800725 is a deficient number, since it is larger than the sum of its proper divisors (12432205).

51800725 is a wasteful number, since it uses less digits than its factorization.

51800725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072039 (or 2072034 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 51800725 is about 7197.2720526600. The cubic root of 51800725 is about 372.7737129145.

It can be divided in two parts, 51800 and 725, that added together give a palindrome (52525).

The spelling of 51800725 in words is "fifty-one million, eight hundred thousand, seven hundred twenty-five".