31122001231 has 2 divisors, whose sum is σ = 31122001232. Its totient is φ = 31122001230.

The previous prime is 31122001193. The next prime is 31122001237. The reversal of 31122001231 is 13210022113.

It is a strong prime.

It is an emirp because it is prime and its reverse (13210022113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31122001231 - 2⁹ = 31122000719 is a prime.

It is a super-2 number, since 2×31122001231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31122001237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561000615 + 15561000616.

It is an arithmetic number, because the mean of its divisors is an integer number (15561000616).

Almost surely, 2^31122001231 is an apocalyptic number.

31122001231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31122001231 is an equidigital number, since it uses as much as digits as its factorization.

31122001231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31122001231 its reverse (13210022113), we get a palindrome (44332023344).

The spelling of 31122001231 in words is "thirty-one billion, one hundred twenty-two million, one thousand, two hundred thirty-one".