31222393 has 2 divisors, whose sum is σ = 31222394. Its totient is φ = 31222392.

The previous prime is 31222391. The next prime is 31222427. The reversal of 31222393 is 39322213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30603024 + 619369 = 5532^2 + 787^2 .

It is a cyclic number.

It is not a de Polignac number, because 31222393 - 2¹ = 31222391 is a prime.

Together with 31222391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31222391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611196 + 15611197.

It is an arithmetic number, because the mean of its divisors is an integer number (15611197).

Almost surely, 2^31222393 is an apocalyptic number.

It is an amenable number.

31222393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222393 is an equidigital number, since it uses as much as digits as its factorization.

31222393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 25.

The square root of 31222393 is about 5587.7001530147. The cubic root of 31222393 is about 314.8874814389.

The spelling of 31222393 in words is "thirty-one million, two hundred twenty-two thousand, three hundred ninety-three".