1311311231 has 8 divisors (see below), whose sum is σ = 1324851840. Its totient is φ = 1297786392.

The previous prime is 1311311189. The next prime is 1311311263. The reversal of 1311311231 is 1321131131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311311231 - 2¹⁰ = 1311310207 is a prime.

It is a super-2 number, since 2×1311311231² = 3439074289093470722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311311291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238196 + ... + 243638.

It is an arithmetic number, because the mean of its divisors is an integer number (165606480).

Almost surely, 2^1311311231 is an apocalyptic number.

1311311231 is a deficient number, since it is larger than the sum of its proper divisors (13540609).

1311311231 is a wasteful number, since it uses less digits than its factorization.

1311311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7885.

The product of its digits is 54, while the sum is 17.

The square root of 1311311231 is about 36212.0315779162. The cubic root of 1311311231 is about 1094.5491304201.

Adding to 1311311231 its reverse (1321131131), we get a palindrome (2632442362).

The spelling of 1311311231 in words is "one billion, three hundred eleven million, three hundred eleven thousand, two hundred thirty-one".