31222249 has 2 divisors, whose sum is σ = 31222250. Its totient is φ = 31222248.

The previous prime is 31222211. The next prime is 31222253. The reversal of 31222249 is 94222213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 85849 = 5580^2 + 293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31222249 is a prime.

It is not a weakly prime, because it can be changed into another prime (31222349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611124 + 15611125.

It is an arithmetic number, because the mean of its divisors is an integer number (15611125).

Almost surely, 2^31222249 is an apocalyptic number.

It is an amenable number.

31222249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222249 is an equidigital number, since it uses as much as digits as its factorization.

31222249 is an odious number, because the sum of its binary digits is odd.

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

The square root of 31222249 is about 5587.6872675553. The cubic root of 31222249 is about 314.8869973433.

The spelling of 31222249 in words is "thirty-one million, two hundred twenty-two thousand, two hundred forty-nine".