1331641 has 2 divisors, whose sum is σ = 1331642. Its totient is φ = 1331640.

The previous prime is 1331633. The next prime is 1331647. The reversal of 1331641 is 1461331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1299600 + 32041 = 1140^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331641 - 2³ = 1331633 is a prime.

It is a Chen prime.

1331641 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1331647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665820 + 665821.

It is an arithmetic number, because the mean of its divisors is an integer number (665821).

2^1331641 is an apocalyptic number.

It is an amenable number.

1331641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331641 is an equidigital number, since it uses as much as digits as its factorization.

1331641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 1331641 is about 1153.9675038752. The cubic root of 1331641 is about 110.0176555682.

Adding to 1331641 its reverse (1461331), we get a palindrome (2792972).

The spelling of 1331641 in words is "one million, three hundred thirty-one thousand, six hundred forty-one".