31434731213 has 2 divisors, whose sum is σ = 31434731214. Its totient is φ = 31434731212.

The previous prime is 31434731191. The next prime is 31434731227. The reversal of 31434731213 is 31213743413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28570126729 + 2864604484 = 169027^2 + 53522^2 .

It is an emirp because it is prime and its reverse (31213743413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31434731213 - 2¹² = 31434727117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31434731213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31434730213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15717365606 + 15717365607.

It is an arithmetic number, because the mean of its divisors is an integer number (15717365607).

Almost surely, 2^31434731213 is an apocalyptic number.

It is an amenable number.

31434731213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31434731213 is an equidigital number, since it uses as much as digits as its factorization.

31434731213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 32.

The spelling of 31434731213 in words is "thirty-one billion, four hundred thirty-four million, seven hundred thirty-one thousand, two hundred thirteen".