51118425 has 24 divisors (see below), whose sum is σ = 93907680. Its totient is φ = 27262800.

The previous prime is 51118421. The next prime is 51118433. The reversal of 51118425 is 52481115.

It is not a de Polignac number, because 51118425 - 2² = 51118421 is a prime.

It is a super-2 number, since 2×51118425² = 5226186748961250, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (51118421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37191 + ... + 38540.

It is an arithmetic number, because the mean of its divisors is an integer number (3912820).

Almost surely, 2^51118425 is an apocalyptic number.

It is an amenable number.

51118425 is a deficient number, since it is larger than the sum of its proper divisors (42789255).

51118425 is a wasteful number, since it uses less digits than its factorization.

51118425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75750 (or 75739 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 51118425 is about 7149.7150292861. The cubic root of 51118425 is about 371.1297947740.

The spelling of 51118425 in words is "fifty-one million, one hundred eighteen thousand, four hundred twenty-five".