31224229 has 2 divisors, whose sum is σ = 31224230. Its totient is φ = 31224228.

The previous prime is 31224209. The next prime is 31224269. The reversal of 31224229 is 92242213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 14455204 = 4095^2 + 3802^2 .

It is a cyclic number.

It is not a de Polignac number, because 31224229 - 2¹⁷ = 31093157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31224209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612114 + 15612115.

It is an arithmetic number, because the mean of its divisors is an integer number (15612115).

Almost surely, 2^31224229 is an apocalyptic number.

It is an amenable number.

31224229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31224229 is an equidigital number, since it uses as much as digits as its factorization.

31224229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 31224229 is about 5587.8644400164. The cubic root of 31224229 is about 314.8936535270.

The spelling of 31224229 in words is "thirty-one million, two hundred twenty-four thousand, two hundred twenty-nine".