31211133013 has 2 divisors, whose sum is σ = 31211133014. Its totient is φ = 31211133012.

The previous prime is 31211132999. The next prime is 31211133049. The reversal of 31211133013 is 31033111213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31012266609 + 198866404 = 176103^2 + 14102^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211133013 - 2⁹ = 31211132501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31211133053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605566506 + 15605566507.

It is an arithmetic number, because the mean of its divisors is an integer number (15605566507).

Almost surely, 2^31211133013 is an apocalyptic number.

It is an amenable number.

31211133013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211133013 is an equidigital number, since it uses as much as digits as its factorization.

31211133013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31211133013 its reverse (31033111213), we get a palindrome (62244244226).

The spelling of 31211133013 in words is "thirty-one billion, two hundred eleven million, one hundred thirty-three thousand, thirteen".