31130203309 has 4 divisors (see below), whose sum is σ = 31139201340. Its totient is φ = 31121205280.

The previous prime is 31130203303. The next prime is 31130203319. The reversal of 31130203309 is 90330203113.

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 11752728100 + 19377475209 = 108410^2 + 139203^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130203309 - 2⁹ = 31130202797 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 (31130203303) 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, 4493824 + ... + 4500745.

It is an arithmetic number, because the mean of its divisors is an integer number (7784800335).

Almost surely, 2^31130203309 is an apocalyptic number.

It is an amenable number.

31130203309 is a deficient number, since it is larger than the sum of its proper divisors (8998031).

31130203309 is an equidigital number, since it uses as much as digits as its factorization.

31130203309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8998030.

The product of its (nonzero) digits is 1458, while the sum is 25.

The spelling of 31130203309 in words is "thirty-one billion, one hundred thirty million, two hundred three thousand, three hundred nine".