1311511223 has 32 divisors (see below), whose sum is σ = 1559492352. Its totient is φ = 1089446400.

The previous prime is 1311511181. The next prime is 1311511237. The reversal of 1311511223 is 3221151131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311511223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311511195 and 1311511204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311511273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1696265 + ... + 1697037.

It is an arithmetic number, because the mean of its divisors is an integer number (48734136).

Almost surely, 2^1311511223 is an apocalyptic number.

1311511223 is a deficient number, since it is larger than the sum of its proper divisors (247981129).

1311511223 is a wasteful number, since it uses less digits than its factorization.

1311511223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055.

The product of its digits is 180, while the sum is 20.

The square root of 1311511223 is about 36214.7928752879. The cubic root of 1311511223 is about 1094.6047719126.

Adding to 1311511223 its reverse (3221151131), we get a palindrome (4532662354).

The spelling of 1311511223 in words is "one billion, three hundred eleven million, five hundred eleven thousand, two hundred twenty-three".