1331001 has 24 divisors (see below), whose sum is σ = 2260544. Its totient is φ = 738720.

The previous prime is 1330997. The next prime is 1331023. The reversal of 1331001 is 1001331.

It is a Cunningham number, because it is equal to 110³+1.

It is not a de Polignac number, because 1331001 - 2² = 1330997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331041) 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 23 ways as a sum of consecutive naturals, for example, 2046 + ... + 2616.

2^1331001 is an apocalyptic number.

It is an amenable number.

1331001 is a deficient number, since it is larger than the sum of its proper divisors (929543).

1331001 is a wasteful number, since it uses less digits than its factorization.

1331001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 9.

The square root of 1331001 is about 1153.6901663792. The cubic root of 1331001 is about 110.0000275482. Note that the first 4 decimals are identical.

Adding to 1331001 its reverse (1001331), we get a palindrome (2332332).

The spelling of 1331001 in words is "one million, three hundred thirty-one thousand, one".