51425365 has 4 divisors (see below), whose sum is σ = 61710444. Its totient is φ = 41140288.

The previous prime is 51425351. The next prime is 51425383. The reversal of 51425365 is 56352415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30713764 + 20711601 = 5542^2 + 4551^2 .

It is a cyclic number.

It is not a de Polignac number, because 51425365 - 2⁵ = 51425333 is a prime.

It is a super-4 number, since 4×51425365⁴ (a number of 32 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5142532 + ... + 5142541.

It is an arithmetic number, because the mean of its divisors is an integer number (15427611).

Almost surely, 2^51425365 is an apocalyptic number.

It is an amenable number.

51425365 is a deficient number, since it is larger than the sum of its proper divisors (10285079).

51425365 is a wasteful number, since it uses less digits than its factorization.

51425365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10285078.

The product of its digits is 18000, while the sum is 31.

The square root of 51425365 is about 7171.1480949706. The cubic root of 51425365 is about 371.8711278461.

The spelling of 51425365 in words is "fifty-one million, four hundred twenty-five thousand, three hundred sixty-five".