1331233181 has 2 divisors, whose sum is σ = 1331233182. Its totient is φ = 1331233180.

The previous prime is 1331233159. The next prime is 1331233201. The reversal of 1331233181 is 1813321331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1295640025 + 35593156 = 35995^2 + 5966^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331233181 - 2²² = 1327038877 is a prime.

It is a super-2 number, since 2×1331233181² = 3544363564390757522, 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 1331233181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331233381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665616590 + 665616591.

It is an arithmetic number, because the mean of its divisors is an integer number (665616591).

Almost surely, 2^1331233181 is an apocalyptic number.

It is an amenable number.

1331233181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331233181 is an equidigital number, since it uses as much as digits as its factorization.

1331233181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 1331233181 is about 36486.0683138099. The cubic root of 1331233181 is about 1100.0642334392.

The spelling of 1331233181 in words is "one billion, three hundred thirty-one million, two hundred thirty-three thousand, one hundred eighty-one".