1231708199 has 2 divisors, whose sum is σ = 1231708200. Its totient is φ = 1231708198.

The previous prime is 1231708189. The next prime is 1231708201. The reversal of 1231708199 is 9918071321.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9918071321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231708199 is a prime.

Together with 1231708201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231708109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615854099 + 615854100.

It is an arithmetic number, because the mean of its divisors is an integer number (615854100).

Almost surely, 2^1231708199 is an apocalyptic number.

1231708199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231708199 is an equidigital number, since it uses as much as digits as its factorization.

1231708199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1231708199 is about 35095.7005771362. The cubic root of 1231708199 is about 1071.9370388762.

The spelling of 1231708199 in words is "one billion, two hundred thirty-one million, seven hundred eight thousand, one hundred ninety-nine".