31213211231287 has 2 divisors, whose sum is σ = 31213211231288. Its totient is φ = 31213211231286.

The previous prime is 31213211231143. The next prime is 31213211231311. The reversal of 31213211231287 is 78213211231213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31213211231287 - 2³¹ = 31211063747639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213211201287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606605615643 + 15606605615644.

It is an arithmetic number, because the mean of its divisors is an integer number (15606605615644).

Almost surely, 2^{31213211231287} is an apocalyptic number.

31213211231287 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213211231287 is an equidigital number, since it uses as much as digits as its factorization.

31213211231287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The spelling of 31213211231287 in words is "thirty-one trillion, two hundred thirteen billion, two hundred eleven million, two hundred thirty-one thousand, two hundred eighty-seven".