31104389 has 2 divisors, whose sum is σ = 31104390. Its totient is φ = 31104388.

The previous prime is 31104361. The next prime is 31104413. The reversal of 31104389 is 98340113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 390625 = 5542^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 31104389 - 2¹⁶ = 31038853 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31104329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15552194 + 15552195.

It is an arithmetic number, because the mean of its divisors is an integer number (15552195).

Almost surely, 2^31104389 is an apocalyptic number.

It is an amenable number.

31104389 is a deficient number, since it is larger than the sum of its proper divisors (1).

31104389 is an equidigital number, since it uses as much as digits as its factorization.

31104389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 31104389 is about 5577.1308932102. The cubic root of 31104389 is about 314.4902783444.

The spelling of 31104389 in words is "thirty-one million, one hundred four thousand, three hundred eighty-nine".