31323332009 has 2 divisors, whose sum is σ = 31323332010. Its totient is φ = 31323332008.

The previous prime is 31323331973. The next prime is 31323332011. The reversal of 31323332009 is 90023332313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24540162409 + 6783169600 = 156653^2 + 82360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323332009 is a prime.

It is a super-2 number, since 2×31323332009² (a number of 22 digits) contains 22 as substring.

Together with 31323332011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31323331009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661666004 + 15661666005.

It is an arithmetic number, because the mean of its divisors is an integer number (15661666005).

Almost surely, 2^31323332009 is an apocalyptic number.

It is an amenable number.

31323332009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323332009 is an equidigital number, since it uses as much as digits as its factorization.

31323332009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 29.

The spelling of 31323332009 in words is "thirty-one billion, three hundred twenty-three million, three hundred thirty-two thousand, nine".