1311120231 has 8 divisors (see below), whose sum is σ = 1804552704. Its totient is φ = 845883960.

The previous prime is 1311120211. The next prime is 1311120233. The reversal of 1311120231 is 1320211131.

It is a happy number.

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

It is not a de Polignac number, because 1311120231 - 2¹⁰ = 1311119207 is a prime.

It is a super-2 number, since 2×1311120231² = 3438072520274986722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1311120231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311120233) 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, 7048941 + ... + 7049126.

It is an arithmetic number, because the mean of its divisors is an integer number (225569088).

Almost surely, 2^1311120231 is an apocalyptic number.

1311120231 is a deficient number, since it is larger than the sum of its proper divisors (493432473).

1311120231 is a wasteful number, since it uses less digits than its factorization.

1311120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14098101.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311120231 is about 36209.3942368552. The cubic root of 1311120231 is about 1094.4959853873.

Adding to 1311120231 its reverse (1320211131), we get a palindrome (2631331362).

The spelling of 1311120231 in words is "one billion, three hundred eleven million, one hundred twenty thousand, two hundred thirty-one".