1231134311 has 4 divisors (see below), whose sum is σ = 1343055624. Its totient is φ = 1119213000.

The previous prime is 1231134299. The next prime is 1231134319. The reversal of 1231134311 is 1134311321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231134311 - 2²² = 1226940007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231134319) 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, 55960640 + ... + 55960661.

It is an arithmetic number, because the mean of its divisors is an integer number (335763906).

Almost surely, 2^1231134311 is an apocalyptic number.

1231134311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231134311 is a deficient number, since it is larger than the sum of its proper divisors (111921313).

1231134311 is a wasteful number, since it uses less digits than its factorization.

1231134311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111921312.

The product of its digits is 216, while the sum is 20.

The square root of 1231134311 is about 35087.5235803270. The cubic root of 1231134311 is about 1071.7705309943.

Adding to 1231134311 its reverse (1134311321), we get a palindrome (2365445632).

The spelling of 1231134311 in words is "one billion, two hundred thirty-one million, one hundred thirty-four thousand, three hundred eleven".