31123229 has 2 divisors, whose sum is σ = 31123230. Its totient is φ = 31123228.

The previous prime is 31123217. The next prime is 31123241. The reversal of 31123229 is 92232113.

It is a balanced prime because it is at equal distance from previous prime (31123217) and next prime (31123241).

It can be written as a sum of positive squares in only one way, i.e., 28334329 + 2788900 = 5323^2 + 1670^2 .

It is an emirp because it is prime and its reverse (92232113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31123229 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561614 + 15561615.

It is an arithmetic number, because the mean of its divisors is an integer number (15561615).

Almost surely, 2^31123229 is an apocalyptic number.

It is an amenable number.

31123229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123229 is an equidigital number, since it uses as much as digits as its factorization.

31123229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

The square root of 31123229 is about 5578.8196780323. The cubic root of 31123229 is about 314.5537613573.

The spelling of 31123229 in words is "thirty-one million, one hundred twenty-three thousand, two hundred twenty-nine".