51431289 has 32 divisors (see below), whose sum is σ = 88080384. Its totient is φ = 25945920.

The previous prime is 51431279. The next prime is 51431293. The reversal of 51431289 is 98213415.

51431289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51431289 - 2⁵ = 51431257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51431249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2184 + ... + 10374.

It is an arithmetic number, because the mean of its divisors is an integer number (2752512).

Almost surely, 2^51431289 is an apocalyptic number.

It is an amenable number.

51431289 is a deficient number, since it is larger than the sum of its proper divisors (36649095).

51431289 is a wasteful number, since it uses less digits than its factorization.

51431289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8237.

The product of its digits is 8640, while the sum is 33.

The square root of 51431289 is about 7171.5611271187. The cubic root of 51431289 is about 371.8854066621.

The spelling of 51431289 in words is "fifty-one million, four hundred thirty-one thousand, two hundred eighty-nine".