1331232231 has 16 divisors (see below), whose sum is σ = 2034368000. Its totient is φ = 758520288.

The previous prime is 1331232229. The next prime is 1331232233. The reversal of 1331232231 is 1322321331.

It is an interprime number because it is at equal distance from previous prime (1331232229) and next prime (1331232233).

It is not a de Polignac number, because 1331232231 - 2¹ = 1331232229 is a prime.

It is a super-2 number, since 2×1331232231² = 3544358505706474722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1331232198 and 1331232207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331232233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83491 + ... + 98148.

It is an arithmetic number, because the mean of its divisors is an integer number (127148000).

Almost surely, 2^1331232231 is an apocalyptic number.

1331232231 is a deficient number, since it is larger than the sum of its proper divisors (703135769).

1331232231 is a wasteful number, since it uses less digits than its factorization.

1331232231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181998.

The product of its digits is 648, while the sum is 21.

The square root of 1331232231 is about 36486.0552951398. The cubic root of 1331232231 is about 1100.0639717617.

Adding to 1331232231 its reverse (1322321331), we get a palindrome (2653553562).

The spelling of 1331232231 in words is "one billion, three hundred thirty-one million, two hundred thirty-two thousand, two hundred thirty-one".