1311003231 has 4 divisors (see below), whose sum is σ = 1748004312. Its totient is φ = 874002152.

The previous prime is 1311003179. The next prime is 1311003247. The reversal of 1311003231 is 1323001131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1323001131 = 3 ⋅441000377.

It is a cyclic number.

It is not a de Polignac number, because 1311003231 - 2¹³ = 1310995039 is a prime.

It is a super-2 number, since 2×1311003231² = 3437458943384878722, 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 1311003231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311003251) 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, 218500536 + ... + 218500541.

It is an arithmetic number, because the mean of its divisors is an integer number (437001078).

Almost surely, 2^1311003231 is an apocalyptic number.

1311003231 is a deficient number, since it is larger than the sum of its proper divisors (437001081).

1311003231 is an equidigital number, since it uses as much as digits as its factorization.

1311003231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437001080.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1311003231 is about 36207.7785979753. The cubic root of 1311003231 is about 1094.4634280274.

Adding to 1311003231 its reverse (1323001131), we get a palindrome (2634004362).

The spelling of 1311003231 in words is "one billion, three hundred eleven million, three thousand, two hundred thirty-one".