1311203120 has 20 divisors (see below), whose sum is σ = 3048547440. Its totient is φ = 524481216.

The previous prime is 1311203111. The next prime is 1311203137. The reversal of 1311203120 is 213021131.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1311203095 and 1311203104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8194940 + ... + 8195099.

It is an arithmetic number, because the mean of its divisors is an integer number (152427372).

Almost surely, 2^1311203120 is an apocalyptic number.

1311203120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311203120 is an abundant number, since it is smaller than the sum of its proper divisors (1737344320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311203120 is a wasteful number, since it uses less digits than its factorization.

1311203120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16390052 (or 16390046 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1311203120 is about 36210.5387974275. The cubic root of 1311203120 is about 1094.5190495742.

Adding to 1311203120 its reverse (213021131), we get a palindrome (1524224251).

The spelling of 1311203120 in words is "one billion, three hundred eleven million, two hundred three thousand, one hundred twenty".