31213232971229 has 2 divisors, whose sum is σ = 31213232971230. Its totient is φ = 31213232971228.

The previous prime is 31213232971163. The next prime is 31213232971241. The reversal of 31213232971229 is 92217923231213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27639518728900 + 3573714242329 = 5257330^2 + 1890427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31213232971229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213232971829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606616485614 + 15606616485615.

It is an arithmetic number, because the mean of its divisors is an integer number (15606616485615).

Almost surely, 2^{31213232971229} is an apocalyptic number.

It is an amenable number.

31213232971229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213232971229 is an equidigital number, since it uses as much as digits as its factorization.

31213232971229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The spelling of 31213232971229 in words is "thirty-one trillion, two hundred thirteen billion, two hundred thirty-two million, nine hundred seventy-one thousand, two hundred twenty-nine".