31136334217 has 2 divisors, whose sum is σ = 31136334218. Its totient is φ = 31136334216.

The previous prime is 31136334193. The next prime is 31136334223. The reversal of 31136334217 is 71243363113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17429544441 + 13706789776 = 132021^2 + 117076^2 .

It is a cyclic number.

It is not a de Polignac number, because 31136334217 - 2¹¹ = 31136332169 is a prime.

It is not a weakly prime, because it can be changed into another prime (31136334277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15568167108 + 15568167109.

It is an arithmetic number, because the mean of its divisors is an integer number (15568167109).

Almost surely, 2^31136334217 is an apocalyptic number.

It is an amenable number.

31136334217 is a deficient number, since it is larger than the sum of its proper divisors (1).

31136334217 is an equidigital number, since it uses as much as digits as its factorization.

31136334217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 34.

The spelling of 31136334217 in words is "thirty-one billion, one hundred thirty-six million, three hundred thirty-four thousand, two hundred seventeen".