1243199983 has 2 divisors, whose sum is σ = 1243199984. Its totient is φ = 1243199982.

The previous prime is 1243199981. The next prime is 1243200017. The reversal of 1243199983 is 3899913421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243199983 - 2¹ = 1243199981 is a prime.

Together with 1243199981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243199981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621599991 + 621599992.

It is an arithmetic number, because the mean of its divisors is an integer number (621599992).

Almost surely, 2^1243199983 is an apocalyptic number.

1243199983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243199983 is an equidigital number, since it uses as much as digits as its factorization.

1243199983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 1243199983 is about 35259.0411525895. The cubic root of 1243199983 is about 1075.2604331697.

The spelling of 1243199983 in words is "one billion, two hundred forty-three million, one hundred ninety-nine thousand, nine hundred eighty-three".