31312102309 has 4 divisors (see below), whose sum is σ = 31312712716. Its totient is φ = 31311491904.

The previous prime is 31312102301. The next prime is 31312102313. The reversal of 31312102309 is 90320121313.

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 3013461025 + 28298641284 = 54895^2 + 168222^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312102309 - 2³ = 31312102301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312102301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220404 + ... + 333469.

It is an arithmetic number, because the mean of its divisors is an integer number (7828178179).

Almost surely, 2^31312102309 is an apocalyptic number.

It is an amenable number.

31312102309 is a deficient number, since it is larger than the sum of its proper divisors (610407).

31312102309 is an equidigital number, since it uses as much as digits as its factorization.

31312102309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610406.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 31312102309 in words is "thirty-one billion, three hundred twelve million, one hundred two thousand, three hundred nine".