51125825 has 12 divisors (see below), whose sum is σ = 63767868. Its totient is φ = 40660800.

The previous prime is 51125821. The next prime is 51125831. The reversal of 51125825 is 52852115.

It can be written as a sum of positive squares in 6 ways, for example, as 559504 + 50566321 = 748^2 + 7111^2 .

It is not a de Polignac number, because 51125825 - 2² = 51125821 is a prime.

It is a super-2 number, since 2×51125825² = 5227699963861250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51125821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1586 + ... + 10235.

It is an arithmetic number, because the mean of its divisors is an integer number (5313989).

Almost surely, 2^51125825 is an apocalyptic number.

It is an amenable number.

51125825 is a deficient number, since it is larger than the sum of its proper divisors (12642043).

51125825 is a wasteful number, since it uses less digits than its factorization.

51125825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12004 (or 11999 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The square root of 51125825 is about 7150.2325137019. The cubic root of 51125825 is about 371.1477023938.

The spelling of 51125825 in words is "fifty-one million, one hundred twenty-five thousand, eight hundred twenty-five".