31104289 has 2 divisors, whose sum is σ = 31104290. Its totient is φ = 31104288.

The previous prime is 31104287. The next prime is 31104299. The reversal of 31104289 is 98240113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29073664 + 2030625 = 5392^2 + 1425^2 .

It is an emirp because it is prime and its reverse (98240113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31104289 - 2¹ = 31104287 is a prime.

Together with 31104287, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31104287) 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 as a sum of consecutive naturals, namely, 15552144 + 15552145.

It is an arithmetic number, because the mean of its divisors is an integer number (15552145).

Almost surely, 2^31104289 is an apocalyptic number.

It is an amenable number.

31104289 is a deficient number, since it is larger than the sum of its proper divisors (1).

31104289 is an equidigital number, since it uses as much as digits as its factorization.

31104289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 31104289 is about 5577.1219280199. The cubic root of 31104289 is about 314.4899413173.

The spelling of 31104289 in words is "thirty-one million, one hundred four thousand, two hundred eighty-nine".