1143199991 has 2 divisors, whose sum is σ = 1143199992. Its totient is φ = 1143199990.

The previous prime is 1143199979. The next prime is 1143200057. The reversal of 1143199991 is 1999913411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1143199991 - 2²² = 1139005687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143199951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571599995 + 571599996.

It is an arithmetic number, because the mean of its divisors is an integer number (571599996).

Almost surely, 2^1143199991 is an apocalyptic number.

1143199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143199991 is an equidigital number, since it uses as much as digits as its factorization.

1143199991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 47.

The square root of 1143199991 is about 33811.2406013148. The cubic root of 1143199991 is about 1045.6204555438.

The spelling of 1143199991 in words is "one billion, one hundred forty-three million, one hundred ninety-nine thousand, nine hundred ninety-one".