1331220231 has 32 divisors (see below), whose sum is σ = 2178739200. Its totient is φ = 796573440.

The previous prime is 1331220181. The next prime is 1331220269. The reversal of 1331220231 is 1320221331.

It is not a de Polignac number, because 1331220231 - 2⁶ = 1331220167 is a prime.

It is a super-2 number, since 2×1331220231² = 3544294606847386722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331221231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4906 + ... + 51831.

It is an arithmetic number, because the mean of its divisors is an integer number (68085600).

Almost surely, 2^1331220231 is an apocalyptic number.

1331220231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1331220231 is a deficient number, since it is larger than the sum of its proper divisors (847518969).

1331220231 is a wasteful number, since it uses less digits than its factorization.

1331220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56836 (or 56830 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1331220231 is about 36485.8908483814. The cubic root of 1331220231 is about 1100.0606663511.

Adding to 1331220231 its reverse (1320221331), we get a palindrome (2651441562).

The spelling of 1331220231 in words is "one billion, three hundred thirty-one million, two hundred twenty thousand, two hundred thirty-one".