31133121169 has 2 divisors, whose sum is σ = 31133121170. Its totient is φ = 31133121168.

The previous prime is 31133121163. The next prime is 31133121191. The reversal of 31133121169 is 96112133113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23120723025 + 8012398144 = 152055^2 + 89512^2 .

It is a cyclic number.

It is not a de Polignac number, because 31133121169 - 2³¹ = 28985637521 is a prime.

It is a super-2 number, since 2×31133121169² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31133121169.

It is not a weakly prime, because it can be changed into another prime (31133121163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566560584 + 15566560585.

It is an arithmetic number, because the mean of its divisors is an integer number (15566560585).

Almost surely, 2^31133121169 is an apocalyptic number.

It is an amenable number.

31133121169 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133121169 is an equidigital number, since it uses as much as digits as its factorization.

31133121169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The spelling of 31133121169 in words is "thirty-one billion, one hundred thirty-three million, one hundred twenty-one thousand, one hundred sixty-nine".