51142825 has 6 divisors (see below), whose sum is σ = 63417134. Its totient is φ = 40914240.

The previous prime is 51142789. The next prime is 51142829. The reversal of 51142825 is 52824115.

It can be written as a sum of positive squares in 3 ways, for example, as 4247721 + 46895104 = 2061^2 + 6848^2 .

It is not a de Polignac number, because 51142825 - 2²⁵ = 17588393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51142793 and 51142802.

It is not an unprimeable number, because it can be changed into a prime (51142829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022832 + ... + 1022881.

Almost surely, 2^51142825 is an apocalyptic number.

It is an amenable number.

51142825 is a deficient number, since it is larger than the sum of its proper divisors (12274309).

51142825 is a wasteful number, since it uses less digits than its factorization.

51142825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045723 (or 2045718 counting only the distinct ones).

The product of its digits is 3200, while the sum is 28.

The square root of 51142825 is about 7151.4211874284. The cubic root of 51142825 is about 371.1888349770.

The spelling of 51142825 in words is "fifty-one million, one hundred forty-two thousand, eight hundred twenty-five".