3658661 has 2 divisors, whose sum is σ = 3658662. Its totient is φ = 3658660.

The previous prime is 3658639. The next prime is 3658667. The reversal of 3658661 is 1668563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2910436 + 748225 = 1706^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 3658661 - 2¹⁰ = 3657637 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3658667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1829330 + 1829331.

It is an arithmetic number, because the mean of its divisors is an integer number (1829331).

Almost surely, 2^3658661 is an apocalyptic number.

It is an amenable number.

3658661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3658661 is an equidigital number, since it uses as much as digits as its factorization.

3658661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 3658661 is about 1912.7626617017. The cubic root of 3658661 is about 154.0898587285.

The spelling of 3658661 in words is "three million, six hundred fifty-eight thousand, six hundred sixty-one".