201111231031 has 2 divisors, whose sum is σ = 201111231032. Its totient is φ = 201111231030.

The previous prime is 201111231029. The next prime is 201111231043. The reversal of 201111231031 is 130132111102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201111231031 - 2¹ = 201111231029 is a prime.

It is a super-2 number, since 2×201111231031² (a number of 23 digits) contains 22 as substring.

Together with 201111231029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 201111230996 and 201111231014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111231091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555615515 + 100555615516.

It is an arithmetic number, because the mean of its divisors is an integer number (100555615516).

Almost surely, 2^201111231031 is an apocalyptic number.

201111231031 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111231031 is an equidigital number, since it uses as much as digits as its factorization.

201111231031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 201111231031 its reverse (130132111102), we get a palindrome (331243342133).

The spelling of 201111231031 in words is "two hundred one billion, one hundred eleven million, two hundred thirty-one thousand, thirty-one".