1331801 has 2 divisors, whose sum is σ = 1331802. Its totient is φ = 1331800.

The previous prime is 1331789. The next prime is 1331821. The reversal of 1331801 is 1081331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 121801 = 1100^2 + 349^2 .

It is an emirp because it is prime and its reverse (1081331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331801 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331801.

It is not a weakly prime, because it can be changed into another prime (1331821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665900 + 665901.

It is an arithmetic number, because the mean of its divisors is an integer number (665901).

2^1331801 is an apocalyptic number.

It is an amenable number.

1331801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331801 is an equidigital number, since it uses as much as digits as its factorization.

1331801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1331801 is about 1154.0368278352. The cubic root of 1331801 is about 110.0220616907.

The spelling of 1331801 in words is "one million, three hundred thirty-one thousand, eight hundred one".