1381331 has 8 divisors (see below), whose sum is σ = 1617504. Its totient is φ = 1154880.

The previous prime is 1381327. The next prime is 1381337. The reversal of 1381331 is 1331831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1381331 - 2² = 1381327 is a prime.

It is a super-2 number, since 2×1381331² = 3816150663122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1381337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2120 + ... + 2693.

It is an arithmetic number, because the mean of its divisors is an integer number (202188).

2^1381331 is an apocalyptic number.

1381331 is a deficient number, since it is larger than the sum of its proper divisors (236173).

1381331 is an equidigital number, since it uses as much as digits as its factorization.

1381331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861.

The product of its digits is 216, while the sum is 20.

The square root of 1381331 is about 1175.3003871351. The cubic root of 1381331 is about 111.3694101433.

The spelling of 1381331 in words is "one million, three hundred eighty-one thousand, three hundred thirty-one".