1231312211 has 2 divisors, whose sum is σ = 1231312212. Its totient is φ = 1231312210.

The previous prime is 1231312183. The next prime is 1231312217. The reversal of 1231312211 is 1122131321.

It is a strong prime.

It is an emirp because it is prime and its reverse (1122131321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231312211 is a prime.

It is a super-2 number, since 2×1231312211² = 3032259521915417042, 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 1231312211.

It is not a weakly prime, because it can be changed into another prime (1231312217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615656105 + 615656106.

It is an arithmetic number, because the mean of its divisors is an integer number (615656106).

Almost surely, 2^1231312211 is an apocalyptic number.

1231312211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231312211 is an equidigital number, since it uses as much as digits as its factorization.

1231312211 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 1231312211 is about 35090.0585778935. The cubic root of 1231312211 is about 1071.8221524387.

Adding to 1231312211 its reverse (1122131321), we get a palindrome (2353443532).

The spelling of 1231312211 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred eleven".