51168287 has 4 divisors (see below), whose sum is σ = 52416336. Its totient is φ = 49920240.

The previous prime is 51168277. The next prime is 51168319. The reversal of 51168287 is 78286115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78286115 = 5 ⋅15657223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51168287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51168287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51168277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623963 + ... + 624044.

It is an arithmetic number, because the mean of its divisors is an integer number (13104084).

Almost surely, 2^51168287 is an apocalyptic number.

51168287 is a deficient number, since it is larger than the sum of its proper divisors (1248049).

51168287 is a wasteful number, since it uses less digits than its factorization.

51168287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248048.

The product of its digits is 26880, while the sum is 38.

The square root of 51168287 is about 7153.2011715036. The cubic root of 51168287 is about 371.2504248617.

The spelling of 51168287 in words is "fifty-one million, one hundred sixty-eight thousand, two hundred eighty-seven".