31212233231 has 2 divisors, whose sum is σ = 31212233232. Its totient is φ = 31212233230.

The previous prime is 31212233201. The next prime is 31212233251. The reversal of 31212233231 is 13233221213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212233231 is a prime.

It is a super-2 number, since 2×31212233231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31212233197 and 31212233206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212233201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606116615 + 15606116616.

It is an arithmetic number, because the mean of its divisors is an integer number (15606116616).

Almost surely, 2^31212233231 is an apocalyptic number.

31212233231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212233231 is an equidigital number, since it uses as much as digits as its factorization.

31212233231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

Adding to 31212233231 its reverse (13233221213), we get a palindrome (44445454444).

The spelling of 31212233231 in words is "thirty-one billion, two hundred twelve million, two hundred thirty-three thousand, two hundred thirty-one".