51249825 has 36 divisors (see below), whose sum is σ = 100143888. Its totient is φ = 24847200.

The previous prime is 51249823. The next prime is 51249833. The reversal of 51249825 is 52894215.

It is not a de Polignac number, because 51249825 - 2¹ = 51249823 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51249825.

It is not an unprimeable number, because it can be changed into a prime (51249823) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7879 + ... + 12828.

Almost surely, 2^51249825 is an apocalyptic number.

51249825 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51249825 is a deficient number, since it is larger than the sum of its proper divisors (48894063).

51249825 is a wasteful number, since it uses less digits than its factorization.

51249825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20734 (or 20726 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 51249825 is about 7158.8983090976. The cubic root of 51249825 is about 371.4475192856.

The spelling of 51249825 in words is "fifty-one million, two hundred forty-nine thousand, eight hundred twenty-five".