31112022209 has 4 divisors (see below), whose sum is σ = 31432764804. Its totient is φ = 30791279616.

The previous prime is 31112022199. The next prime is 31112022223. The reversal of 31112022209 is 90222021113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20859447184 + 10252575025 = 144428^2 + 101255^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112022209 - 2⁸ = 31112021953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31112022239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160371152 + ... + 160371345.

It is an arithmetic number, because the mean of its divisors is an integer number (7858191201).

Almost surely, 2^31112022209 is an apocalyptic number.

It is an amenable number.

31112022209 is a deficient number, since it is larger than the sum of its proper divisors (320742595).

31112022209 is an equidigital number, since it uses as much as digits as its factorization.

31112022209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320742594.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 31112022209 in words is "thirty-one billion, one hundred twelve million, twenty-two thousand, two hundred nine".