3421661 has 2 divisors, whose sum is σ = 3421662. Its totient is φ = 3421660.

The previous prime is 3421657. The next prime is 3421667. The reversal of 3421661 is 1661243.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2910436 + 511225 = 1706^2 + 715^2 .

It is an emirp because it is prime and its reverse (1661243) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3421661 - 2² = 3421657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3421667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1710830 + 1710831.

It is an arithmetic number, because the mean of its divisors is an integer number (1710831).

Almost surely, 2^3421661 is an apocalyptic number.

It is an amenable number.

3421661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3421661 is an equidigital number, since it uses as much as digits as its factorization.

3421661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 3421661 is about 1849.7732293446. The cubic root of 3421661 is about 150.6881125875.

The spelling of 3421661 in words is "three million, four hundred twenty-one thousand, six hundred sixty-one".