3291661 has 2 divisors, whose sum is σ = 3291662. Its totient is φ = 3291660.

The previous prime is 3291653. The next prime is 3291667. The reversal of 3291661 is 1661923.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2499561 + 792100 = 1581^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 3291661 - 2³ = 3291653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3291667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1645830 + 1645831.

It is an arithmetic number, because the mean of its divisors is an integer number (1645831).

Almost surely, 2^3291661 is an apocalyptic number.

It is an amenable number.

3291661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3291661 is an equidigital number, since it uses as much as digits as its factorization.

3291661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 28.

The square root of 3291661 is about 1814.2935264174. The cubic root of 3291661 is about 148.7550439643.

The spelling of 3291661 in words is "three million, two hundred ninety-one thousand, six hundred sixty-one".