1331342381 has 2 divisors, whose sum is σ = 1331342382. Its totient is φ = 1331342380.

The previous prime is 1331342377. The next prime is 1331342429. The reversal of 1331342381 is 1832431331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1228502500 + 102839881 = 35050^2 + 10141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331342381 - 2² = 1331342377 is a prime.

It is a super-2 number, since 2×1331342381² = 3544945070893498322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331362381) 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 as a sum of consecutive naturals, namely, 665671190 + 665671191.

It is an arithmetic number, because the mean of its divisors is an integer number (665671191).

Almost surely, 2^1331342381 is an apocalyptic number.

It is an amenable number.

1331342381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331342381 is an equidigital number, since it uses as much as digits as its factorization.

1331342381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 1331342381 is about 36487.5647447182. The cubic root of 1331342381 is about 1100.0943117484.

The spelling of 1331342381 in words is "one billion, three hundred thirty-one million, three hundred forty-two thousand, three hundred eighty-one".