31032112009 has 2 divisors, whose sum is σ = 31032112010. Its totient is φ = 31032112008.

The previous prime is 31032111977. The next prime is 31032112037. The reversal of 31032112009 is 90021123013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28091436025 + 2940675984 = 167605^2 + 54228^2 .

It is an emirp because it is prime and its reverse (90021123013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31032112009 - 2⁵ = 31032111977 is a prime.

It is not a weakly prime, because it can be changed into another prime (31032112039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15516056004 + 15516056005.

It is an arithmetic number, because the mean of its divisors is an integer number (15516056005).

Almost surely, 2^31032112009 is an apocalyptic number.

It is an amenable number.

31032112009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31032112009 is an equidigital number, since it uses as much as digits as its factorization.

31032112009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

It can be divided in two parts, 3103 and 2112009, that added together give a palindrome (2115112).

The spelling of 31032112009 in words is "thirty-one billion, thirty-two million, one hundred twelve thousand, nine".