31211200531213 has 2 divisors, whose sum is σ = 31211200531214. Its totient is φ = 31211200531212.

The previous prime is 31211200531177. The next prime is 31211200531229. The reversal of 31211200531213 is 31213500211213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22059958420809 + 9151242110404 = 4696803^2 + 3025102^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211200531213 - 2²¹ = 31211198434061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31211200531913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605600265606 + 15605600265607.

It is an arithmetic number, because the mean of its divisors is an integer number (15605600265607).

Almost surely, 2^{31211200531213} is an apocalyptic number.

It is an amenable number.

31211200531213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211200531213 is an equidigital number, since it uses as much as digits as its factorization.

31211200531213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 31211200531213 its reverse (31213500211213), we get a palindrome (62424700742426).

The spelling of 31211200531213 in words is "thirty-one trillion, two hundred eleven billion, two hundred million, five hundred thirty-one thousand, two hundred thirteen".