1243232311 has 2 divisors, whose sum is σ = 1243232312. Its totient is φ = 1243232310.

The previous prime is 1243232281. The next prime is 1243232327. The reversal of 1243232311 is 1132323421.

It is a strong prime.

It is an emirp because it is prime and its reverse (1132323421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243232311 - 2⁵ = 1243232279 is a prime.

It is a super-2 number, since 2×1243232311² = 3091253158228801442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243232411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621616155 + 621616156.

It is an arithmetic number, because the mean of its divisors is an integer number (621616156).

Almost surely, 2^1243232311 is an apocalyptic number.

1243232311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243232311 is an equidigital number, since it uses as much as digits as its factorization.

1243232311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 1243232311 is about 35259.4995852182. The cubic root of 1243232311 is about 1075.2697533967.

Adding to 1243232311 its reverse (1132323421), we get a palindrome (2375555732).

The spelling of 1243232311 in words is "one billion, two hundred forty-three million, two hundred thirty-two thousand, three hundred eleven".