1205543231 has 2 divisors, whose sum is σ = 1205543232. Its totient is φ = 1205543230.

The previous prime is 1205543203. The next prime is 1205543233. The reversal of 1205543231 is 1323455021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205543231 is a prime.

It is a super-2 number, since 2×1205543231² = 2906668963619838722, which contains 22 as substring.

Together with 1205543233, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1205543231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205543233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602771615 + 602771616.

It is an arithmetic number, because the mean of its divisors is an integer number (602771616).

Almost surely, 2^1205543231 is an apocalyptic number.

1205543231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205543231 is an equidigital number, since it uses as much as digits as its factorization.

1205543231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1205543231 is about 34720.9336135997. The cubic root of 1205543231 is about 1064.2923233275.

Adding to 1205543231 its reverse (1323455021), we get a palindrome (2528998252).

The spelling of 1205543231 in words is "one billion, two hundred five million, five hundred forty-three thousand, two hundred thirty-one".