1243412099 has 2 divisors, whose sum is σ = 1243412100. Its totient is φ = 1243412098.

The previous prime is 1243412087. The next prime is 1243412143. The reversal of 1243412099 is 9902143421.

It is a weak prime.

It is an emirp because it is prime and its reverse (9902143421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243412099 - 2²⁴ = 1226634883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1243412029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621706049 + 621706050.

It is an arithmetic number, because the mean of its divisors is an integer number (621706050).

Almost surely, 2^1243412099 is an apocalyptic number.

1243412099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243412099 is an equidigital number, since it uses as much as digits as its factorization.

1243412099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1243412099 is about 35262.0489903806. The cubic root of 1243412099 is about 1075.3215836885.

The spelling of 1243412099 in words is "one billion, two hundred forty-three million, four hundred twelve thousand, ninety-nine".