51218325 has 36 divisors (see below), whose sum is σ = 95146688. Its totient is φ = 27313200.

The previous prime is 51218311. The next prime is 51218339. The reversal of 51218325 is 52381215.

It is a happy number.

51218325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51218311) and next prime (51218339).

It is not a de Polignac number, because 51218325 - 2⁶ = 51218261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1860 + ... + 10290.

Almost surely, 2^51218325 is an apocalyptic number.

It is an amenable number.

51218325 is a deficient number, since it is larger than the sum of its proper divisors (43928363).

51218325 is an equidigital number, since it uses as much as digits as its factorization.

51218325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8456 (or 8439 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51218325 is about 7156.6979117467. The cubic root of 51218325 is about 371.3714019858.

The spelling of 51218325 in words is "fifty-one million, two hundred eighteen thousand, three hundred twenty-five".