51388825 has 12 divisors (see below), whose sum is σ = 67076560. Its totient is φ = 38946960.

The previous prime is 51388817. The next prime is 51388879. The reversal of 51388825 is 52888315.

It is not a de Polignac number, because 51388825 - 2³ = 51388817 is a prime.

It is a super-2 number, since 2×51388825² = 5281622669761250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53619 + ... + 54568.

Almost surely, 2^51388825 is an apocalyptic number.

It is an amenable number.

51388825 is a deficient number, since it is larger than the sum of its proper divisors (15687735).

51388825 is a wasteful number, since it uses less digits than its factorization.

51388825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108216 (or 108211 counting only the distinct ones).

The product of its digits is 76800, while the sum is 40.

The square root of 51388825 is about 7168.5999330413. The cubic root of 51388825 is about 371.7830300069.

The spelling of 51388825 in words is "fifty-one million, three hundred eighty-eight thousand, eight hundred twenty-five".