31209031209 has 24 divisors (see below), whose sum is σ = 42440447296. Its totient is φ = 20397960000.

The previous prime is 31209031207. The next prime is 31209031219. The reversal of 31209031209 is 90213090213.

It is a happy number.

It is not a de Polignac number, because 31209031209 - 2¹ = 31209031207 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31209031207) 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 in 23 ways as a sum of consecutive naturals, for example, 3147159 + ... + 3157059.

Almost surely, 2^31209031209 is an apocalyptic number.

It is an amenable number.

31209031209 is a deficient number, since it is larger than the sum of its proper divisors (11231416087).

31209031209 is a wasteful number, since it uses less digits than its factorization.

31209031209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10209 (or 10108 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The spelling of 31209031209 in words is "thirty-one billion, two hundred nine million, thirty-one thousand, two hundred nine".