51718289 has 4 divisors (see below), whose sum is σ = 59106624. Its totient is φ = 44329956.

The previous prime is 51718273. The next prime is 51718307. The reversal of 51718289 is 98281715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51718289 - 2⁴ = 51718273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51718229) 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, 3694157 + ... + 3694170.

It is an arithmetic number, because the mean of its divisors is an integer number (14776656).

Almost surely, 2^51718289 is an apocalyptic number.

It is an amenable number.

51718289 is a deficient number, since it is larger than the sum of its proper divisors (7388335).

51718289 is an equidigital number, since it uses as much as digits as its factorization.

51718289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7388334.

The product of its digits is 40320, while the sum is 41.

The square root of 51718289 is about 7191.5428803561. The cubic root of 51718289 is about 372.5758631127.

The spelling of 51718289 in words is "fifty-one million, seven hundred eighteen thousand, two hundred eighty-nine".