3138661 has 2 divisors, whose sum is σ = 3138662. Its totient is φ = 3138660.

The previous prime is 3138647. The next prime is 3138671. The reversal of 3138661 is 1668313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3045025 + 93636 = 1745^2 + 306^2 .

It is an emirp because it is prime and its reverse (1668313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3138661 - 2¹⁹ = 2614373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3138601) 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, 1569330 + 1569331.

It is an arithmetic number, because the mean of its divisors is an integer number (1569331).

Almost surely, 2^3138661 is an apocalyptic number.

It is an amenable number.

3138661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138661 is an equidigital number, since it uses as much as digits as its factorization.

3138661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 3138661 is about 1771.6266536717. The cubic root of 3138661 is about 146.4136172598.

The spelling of 3138661 in words is "three million, one hundred thirty-eight thousand, six hundred sixty-one".