31133242169 has 2 divisors, whose sum is σ = 31133242170. Its totient is φ = 31133242168.

The previous prime is 31133242093. The next prime is 31133242171. The reversal of 31133242169 is 96124233113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20531450944 + 10601791225 = 143288^2 + 102965^2 .

It is an emirp because it is prime and its reverse (96124233113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31133242169 is a prime.

It is a super-2 number, since 2×31133242169² (a number of 22 digits) contains 22 as substring.

Together with 31133242171, 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 (31133242369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566621084 + 15566621085.

It is an arithmetic number, because the mean of its divisors is an integer number (15566621085).

Almost surely, 2^31133242169 is an apocalyptic number.

It is an amenable number.

31133242169 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133242169 is an equidigital number, since it uses as much as digits as its factorization.

31133242169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The spelling of 31133242169 in words is "thirty-one billion, one hundred thirty-three million, two hundred forty-two thousand, one hundred sixty-nine".