991587119 has 2 divisors, whose sum is σ = 991587120. Its totient is φ = 991587118.

The previous prime is 991587071. The next prime is 991587127. The reversal of 991587119 is 911785199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991587119 - 2²⁰ = 990538543 is a prime.

It is a super-2 number, since 2×991587119² = 1966490029133440322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991587319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495793559 + 495793560.

It is an arithmetic number, because the mean of its divisors is an integer number (495793560).

Almost surely, 2^991587119 is an apocalyptic number.

991587119 is a deficient number, since it is larger than the sum of its proper divisors (1).

991587119 is an equidigital number, since it uses as much as digits as its factorization.

991587119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 50.

The square root of 991587119 is about 31489.4763214633. The cubic root of 991587119 is about 997.1878053077.

The spelling of 991587119 in words is "nine hundred ninety-one million, five hundred eighty-seven thousand, one hundred nineteen".