1311123208 has 8 divisors (see below), whose sum is σ = 2458356030. Its totient is φ = 655561600.

The previous prime is 1311123197. The next prime is 1311123221. The reversal of 1311123208 is 8023211131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 738861124 + 572262084 = 27182^2 + 23922^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1311123208² = 3438088133112422528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81945193 + ... + 81945208.

Almost surely, 2^1311123208 is an apocalyptic number.

It is an amenable number.

1311123208 is a deficient number, since it is larger than the sum of its proper divisors (1147232822).

1311123208 is a wasteful number, since it uses less digits than its factorization.

1311123208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163890407 (or 163890403 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1311123208 is about 36209.4353449484. The cubic root of 1311123208 is about 1094.4968137660.

Adding to 1311123208 its reverse (8023211131), we get a palindrome (9334334339).

The spelling of 1311123208 in words is "one billion, three hundred eleven million, one hundred twenty-three thousand, two hundred eight".