1231049899 has 2 divisors, whose sum is σ = 1231049900. Its totient is φ = 1231049898.

The previous prime is 1231049857. The next prime is 1231049933. The reversal of 1231049899 is 9989401321.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9989401321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231049899 - 2²⁹ = 694178987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231049819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615524949 + 615524950.

It is an arithmetic number, because the mean of its divisors is an integer number (615524950).

Almost surely, 2^1231049899 is an apocalyptic number.

1231049899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231049899 is an equidigital number, since it uses as much as digits as its factorization.

1231049899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1231049899 is about 35086.3206819980. The cubic root of 1231049899 is about 1071.7460353290.

The spelling of 1231049899 in words is "one billion, two hundred thirty-one million, forty-nine thousand, eight hundred ninety-nine".