1311123199 has 4 divisors (see below), whose sum is σ = 1320555880. Its totient is φ = 1301690520.

The previous prime is 1311123197. The next prime is 1311123221. The reversal of 1311123199 is 9913211131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1311123199 - 2¹ = 1311123197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311123199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311123197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4716132 + ... + 4716409.

It is an arithmetic number, because the mean of its divisors is an integer number (330138970).

Almost surely, 2^1311123199 is an apocalyptic number.

1311123199 is a deficient number, since it is larger than the sum of its proper divisors (9432681).

1311123199 is an equidigital number, since it uses as much as digits as its factorization.

1311123199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432680.

The product of its digits is 1458, while the sum is 31.

The square root of 1311123199 is about 36209.4352206714. The cubic root of 1311123199 is about 1094.4968112616.

The spelling of 1311123199 in words is "one billion, three hundred eleven million, one hundred twenty-three thousand, one hundred ninety-nine".