51408265 has 4 divisors (see below), whose sum is σ = 61689924. Its totient is φ = 41126608.

The previous prime is 51408241. The next prime is 51408277. The reversal of 51408265 is 56280415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56280415 = 5 ⋅11256083.

It can be written as a sum of positive squares in 2 ways, for example, as 12020089 + 39388176 = 3467^2 + 6276^2 .

It is a cyclic number.

It is not a de Polignac number, because 51408265 - 2⁵ = 51408233 is a prime.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5140822 + ... + 5140831.

It is an arithmetic number, because the mean of its divisors is an integer number (15422481).

Almost surely, 2^51408265 is an apocalyptic number.

It is an amenable number.

51408265 is a deficient number, since it is larger than the sum of its proper divisors (10281659).

51408265 is a wasteful number, since it uses less digits than its factorization.

51408265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10281658.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 51408265 is about 7169.9557181338. The cubic root of 51408265 is about 371.8299049901.

The spelling of 51408265 in words is "fifty-one million, four hundred eight thousand, two hundred sixty-five".