1208233991 has 2 divisors, whose sum is σ = 1208233992. Its totient is φ = 1208233990.

The previous prime is 1208233987. The next prime is 1208233993. The reversal of 1208233991 is 1993328021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1208233991 - 2² = 1208233987 is a prime.

Together with 1208233993, 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 (1208233993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604116995 + 604116996.

It is an arithmetic number, because the mean of its divisors is an integer number (604116996).

Almost surely, 2^1208233991 is an apocalyptic number.

1208233991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1208233991 is an equidigital number, since it uses as much as digits as its factorization.

1208233991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1208233991 is about 34759.6603982260. The cubic root of 1208233991 is about 1065.0835647508.

The spelling of 1208233991 in words is "one billion, two hundred eight million, two hundred thirty-three thousand, nine hundred ninety-one".