3255661 has 2 divisors, whose sum is σ = 3255662. Its totient is φ = 3255660.

The previous prime is 3255649. The next prime is 3255671. The reversal of 3255661 is 1665523.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1705636 + 1550025 = 1306^2 + 1245^2 .

It is an emirp because it is prime and its reverse (1665523) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3255661 is a prime.

It is a Chen prime.

3255661 is a lucky number.

It is equal to p₂₃₃₉₄₇ and since 3255661 and 233947 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3255601) 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, 1627830 + 1627831.

It is an arithmetic number, because the mean of its divisors is an integer number (1627831).

Almost surely, 2^3255661 is an apocalyptic number.

It is an amenable number.

3255661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3255661 is an equidigital number, since it uses as much as digits as its factorization.

3255661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 3255661 is about 1804.3450335232. The cubic root of 3255661 is about 148.2107570734.

It can be divided in two parts, 3255 and 661, that added together give a triangular number (3916 = T₈₈).

The spelling of 3255661 in words is "three million, two hundred fifty-five thousand, six hundred sixty-one".