31133133331231 has 2 divisors, whose sum is σ = 31133133331232. Its totient is φ = 31133133331230.

The previous prime is 31133133331199. The next prime is 31133133331241. The reversal of 31133133331231 is 13213333133113.

It is a strong prime.

It is an emirp because it is prime and its reverse (13213333133113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31133133331231 - 2⁵ = 31133133331199 is a prime.

It is a super-2 number, since 2×31133133331231² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31133133331193 and 31133133331202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31133133331241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566566665615 + 15566566665616.

It is an arithmetic number, because the mean of its divisors is an integer number (15566566665616).

Almost surely, 2^{31133133331231} is an apocalyptic number.

31133133331231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133133331231 is an equidigital number, since it uses as much as digits as its factorization.

31133133331231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 31.

Adding to 31133133331231 its reverse (13213333133113), we get a palindrome (44346466464344).

The spelling of 31133133331231 in words is "thirty-one trillion, one hundred thirty-three billion, one hundred thirty-three million, three hundred thirty-one thousand, two hundred thirty-one".