1768661 has 2 divisors, whose sum is σ = 1768662. Its totient is φ = 1768660.

The previous prime is 1768651. The next prime is 1768667. The reversal of 1768661 is 1668671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1739761 + 28900 = 1319^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1768661 - 2⁶ = 1768597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1768667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 884330 + 884331.

It is an arithmetic number, because the mean of its divisors is an integer number (884331).

2^1768661 is an apocalyptic number.

It is an amenable number.

1768661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1768661 is an equidigital number, since it uses as much as digits as its factorization.

1768661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 1768661 is about 1329.9101473408. The cubic root of 1768661 is about 120.9339393063.

The spelling of 1768661 in words is "one million, seven hundred sixty-eight thousand, six hundred sixty-one".