1331761 has 2 divisors, whose sum is σ = 1331762. Its totient is φ = 1331760.

The previous prime is 1331749. The next prime is 1331773. The reversal of 1331761 is 1671331.

It is a balanced prime because it is at equal distance from previous prime (1331749) and next prime (1331773).

It can be written as a sum of positive squares in only one way, i.e., 1311025 + 20736 = 1145^2 + 144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331761 - 2⁷ = 1331633 is a prime.

It is a super-2 number, since 2×1331761² = 3547174722242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1331711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665880 + 665881.

It is an arithmetic number, because the mean of its divisors is an integer number (665881).

2^1331761 is an apocalyptic number.

It is an amenable number.

1331761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331761 is an equidigital number, since it uses as much as digits as its factorization.

1331761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 22.

The square root of 1331761 is about 1154.0194972356. The cubic root of 1331761 is about 110.0209601932.

The spelling of 1331761 in words is "one million, three hundred thirty-one thousand, seven hundred sixty-one".