1185507899 has 2 divisors, whose sum is σ = 1185507900. Its totient is φ = 1185507898.

The previous prime is 1185507833. The next prime is 1185507901. The reversal of 1185507899 is 9987055811.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9987055811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1185507899 - 2⁸ = 1185507643 is a prime.

It is a Sophie Germain prime.

Together with 1185507901, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1185507899.

It is not a weakly prime, because it can be changed into another prime (1185504899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 592753949 + 592753950.

It is an arithmetic number, because the mean of its divisors is an integer number (592753950).

Almost surely, 2^1185507899 is an apocalyptic number.

1185507899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1185507899 is an equidigital number, since it uses as much as digits as its factorization.

1185507899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 53.

The square root of 1185507899 is about 34431.2053085569. The cubic root of 1185507899 is about 1058.3634110589.

The spelling of 1185507899 in words is "one billion, one hundred eighty-five million, five hundred seven thousand, eight hundred ninety-nine".