1231903199 has 4 divisors (see below), whose sum is σ = 1232832864. Its totient is φ = 1230973536.

The previous prime is 1231903159. The next prime is 1231903213. The reversal of 1231903199 is 9913091321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9913091321 = 7 ⋅1416155903.

It is a cyclic number.

It is not a de Polignac number, because 1231903199 - 2¹² = 1231899103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231903159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462842 + ... + 465495.

It is an arithmetic number, because the mean of its divisors is an integer number (308208216).

Almost surely, 2^1231903199 is an apocalyptic number.

1231903199 is a deficient number, since it is larger than the sum of its proper divisors (929665).

1231903199 is an equidigital number, since it uses as much as digits as its factorization.

1231903199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929664.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1231903199 is about 35098.4785852606. The cubic root of 1231903199 is about 1071.9936044093.

The spelling of 1231903199 in words is "one billion, two hundred thirty-one million, nine hundred three thousand, one hundred ninety-nine".