31102229 has 2 divisors, whose sum is σ = 31102230. Its totient is φ = 31102228.

The previous prime is 31102219. The next prime is 31102241. The reversal of 31102229 is 92220113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30228004 + 874225 = 5498^2 + 935^2 .

It is an emirp because it is prime and its reverse (92220113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31102229 - 2⁴ = 31102213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31102229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31102219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551114 + 15551115.

It is an arithmetic number, because the mean of its divisors is an integer number (15551115).

Almost surely, 2^31102229 is an apocalyptic number.

It is an amenable number.

31102229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31102229 is an equidigital number, since it uses as much as digits as its factorization.

31102229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31102229 is about 5576.9372418918. The cubic root of 31102229 is about 314.4829983993.

The spelling of 31102229 in words is "thirty-one million, one hundred two thousand, two hundred twenty-nine".