1331331 has 4 divisors (see below), whose sum is σ = 1775112. Its totient is φ = 887552.

The previous prime is 1331329. The next prime is 1331333.

1331331 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1331329) and next prime (1331333).

It is a cyclic number.

It is not a de Polignac number, because 1331331 - 2¹ = 1331329 is a prime.

It is a super-2 number, since 2×1331331² = 3544884463122, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331331.

It is not an unprimeable number, because it can be changed into a prime (1331333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221886 + ... + 221891.

It is an arithmetic number, because the mean of its divisors is an integer number (443778).

2^1331331 is an apocalyptic number.

1331331 is a deficient number, since it is larger than the sum of its proper divisors (443781).

1331331 is an equidigital number, since it uses as much as digits as its factorization.

1331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443780.

The product of its digits is 81, while the sum is 15.

The square root of 1331331 is about 1153.8331768501. The cubic root of 1331331 is about 110.0091177015.

The spelling of 1331331 in words is "one million, three hundred thirty-one thousand, three hundred thirty-one".