31313231009 has 4 divisors (see below), whose sum is σ = 31313638020. Its totient is φ = 31312824000.

The previous prime is 31313230999. The next prime is 31313231051. The reversal of 31313231009 is 90013231313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3778806784 + 27534424225 = 61472^2 + 165935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313231009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313231069) 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, 49004 + ... + 255005.

It is an arithmetic number, because the mean of its divisors is an integer number (7828409505).

Almost surely, 2^31313231009 is an apocalyptic number.

It is an amenable number.

31313231009 is a deficient number, since it is larger than the sum of its proper divisors (407011).

31313231009 is a wasteful number, since it uses less digits than its factorization.

31313231009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407010.

The product of its (nonzero) digits is 1458, while the sum is 26.

The spelling of 31313231009 in words is "thirty-one billion, three hundred thirteen million, two hundred thirty-one thousand, nine".