1231232111 has 2 divisors, whose sum is σ = 1231232112. Its totient is φ = 1231232110.

The previous prime is 1231232059. The next prime is 1231232179. The reversal of 1231232111 is 1112321321.

It is a weak prime.

It is an emirp because it is prime and its reverse (1112321321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231232111 - 2¹⁰ = 1231231087 is a prime.

It is a super-2 number, since 2×1231232111² = 3031865022315032642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231232111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231232311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615616055 + 615616056.

It is an arithmetic number, because the mean of its divisors is an integer number (615616056).

Almost surely, 2^1231232111 is an apocalyptic number.

1231232111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231232111 is an equidigital number, since it uses as much as digits as its factorization.

1231232111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 1231232111 is about 35088.9172104241. The cubic root of 1231232111 is about 1071.7989103464.

Adding to 1231232111 its reverse (1112321321), we get a palindrome (2343553432).

The spelling of 1231232111 in words is "one billion, two hundred thirty-one million, two hundred thirty-two thousand, one hundred eleven".