51205725 has 18 divisors (see below), whose sum is σ = 91715546. Its totient is φ = 27309600.

The previous prime is 51205709. The next prime is 51205747. The reversal of 51205725 is 52750215.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6610041 + 44595684 = 2571^2 + 6678^2 .

It is not a de Polignac number, because 51205725 - 2⁴ = 51205709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 113566 + ... + 114015.

Almost surely, 2^51205725 is an apocalyptic number.

It is an amenable number.

51205725 is a deficient number, since it is larger than the sum of its proper divisors (40509821).

51205725 is a wasteful number, since it uses less digits than its factorization.

51205725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227597 (or 227589 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 51205725 is about 7155.8175633536. The cubic root of 51205725 is about 371.3409463274.

The spelling of 51205725 in words is "fifty-one million, two hundred five thousand, seven hundred twenty-five".