51240425 has 6 divisors (see below), whose sum is σ = 63538158. Its totient is φ = 40992320.

The previous prime is 51240407. The next prime is 51240433. The reversal of 51240425 is 52404215.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8886361 + 42354064 = 2981^2 + 6508^2 .

It is not a de Polignac number, because 51240425 - 2¹⁰ = 51239401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51240425.

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, 1024784 + ... + 1024833.

It is an arithmetic number, because the mean of its divisors is an integer number (10589693).

Almost surely, 2^51240425 is an apocalyptic number.

It is an amenable number.

51240425 is a deficient number, since it is larger than the sum of its proper divisors (12297733).

51240425 is a wasteful number, since it uses less digits than its factorization.

51240425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049627 (or 2049622 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 51240425 is about 7158.2417533917. The cubic root of 51240425 is about 371.4248081825.

The spelling of 51240425 in words is "fifty-one million, two hundred forty thousand, four hundred twenty-five".