31012012111 has 2 divisors, whose sum is σ = 31012012112. Its totient is φ = 31012012110.

The previous prime is 31012012091. The next prime is 31012012117. The reversal of 31012012111 is 11121021013.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31012012111 - 2⁵ = 31012012079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31012012091 and 31012012100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31012012117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506006055 + 15506006056.

It is an arithmetic number, because the mean of its divisors is an integer number (15506006056).

Almost surely, 2^31012012111 is an apocalyptic number.

31012012111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012012111 is an equidigital number, since it uses as much as digits as its factorization.

31012012111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31012012111 its reverse (11121021013), we get a palindrome (42133033124).

The spelling of 31012012111 in words is "thirty-one billion, twelve million, twelve thousand, one hundred eleven".