31212302009 has 4 divisors (see below), whose sum is σ = 35671202304. Its totient is φ = 26753401716.

The previous prime is 31212301987. The next prime is 31212302021. The reversal of 31212302009 is 90020321213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31212302009 - 2⁸ = 31212301753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212302089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2229450137 + ... + 2229450150.

It is an arithmetic number, because the mean of its divisors is an integer number (8917800576).

Almost surely, 2^31212302009 is an apocalyptic number.

It is an amenable number.

31212302009 is a deficient number, since it is larger than the sum of its proper divisors (4458900295).

31212302009 is an equidigital number, since it uses as much as digits as its factorization.

31212302009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458900294.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 31212302009 in words is "thirty-one billion, two hundred twelve million, three hundred two thousand, nine".