51009425 has 6 divisors (see below), whose sum is σ = 63251718. Its totient is φ = 40807520.

The previous prime is 51009379. The next prime is 51009437. The reversal of 51009425 is 52490015.

It can be written as a sum of positive squares in 3 ways, for example, as 215296 + 50794129 = 464^2 + 7127^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51009425 is a prime.

It is a super-2 number, since 2×51009425² = 5203922877661250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51009394 and 51009403.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1020164 + ... + 1020213.

It is an arithmetic number, because the mean of its divisors is an integer number (10541953).

Almost surely, 2^51009425 is an apocalyptic number.

It is an amenable number.

51009425 is a deficient number, since it is larger than the sum of its proper divisors (12242293).

51009425 is a wasteful number, since it uses less digits than its factorization.

51009425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040387 (or 2040382 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 51009425 is about 7142.0882800481. The cubic root of 51009425 is about 370.8658199317.

The spelling of 51009425 in words is "fifty-one million, nine thousand, four hundred twenty-five".