1331917 has 4 divisors (see below), whose sum is σ = 1338876. Its totient is φ = 1324960.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331917 is 7191331.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1212201 + 119716 = 1101^2 + 346^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331917 - 2⁷ = 1331789 is a prime.

It is a Duffinian number.

1331917 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1331891 and 1331900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3184 + ... + 3577.

It is an arithmetic number, because the mean of its divisors is an integer number (334719).

2^1331917 is an apocalyptic number.

It is an amenable number.

1331917 is a deficient number, since it is larger than the sum of its proper divisors (6959).

1331917 is an equidigital number, since it uses as much as digits as its factorization.

1331917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6958.

The product of its digits is 567, while the sum is 25.

The square root of 1331917 is about 1154.0870851023. The cubic root of 1331917 is about 110.0252559088.

The spelling of 1331917 in words is "one million, three hundred thirty-one thousand, nine hundred seventeen".