31122229 has 2 divisors, whose sum is σ = 31122230. Its totient is φ = 31122228.

The previous prime is 31122173. The next prime is 31122253. The reversal of 31122229 is 92222113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30360100 + 762129 = 5510^2 + 873^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122229 - 2⁷ = 31122101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31122269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561114 + 15561115.

It is an arithmetic number, because the mean of its divisors is an integer number (15561115).

Almost surely, 2^31122229 is an apocalyptic number.

It is an amenable number.

31122229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122229 is an equidigital number, since it uses as much as digits as its factorization.

31122229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 31122229 is about 5578.7300526195. The cubic root of 31122229 is about 314.5503924145.

The spelling of 31122229 in words is "thirty-one million, one hundred twenty-two thousand, two hundred twenty-nine".