3661559 has 8 divisors (see below), whose sum is σ = 4009728. Its totient is φ = 3315960.

The previous prime is 3661543. The next prime is 3661561. The reversal of 3661559 is 9551663.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3661559 - 2⁴ = 3661543 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3584 + ... + 4490.

It is an arithmetic number, because the mean of its divisors is an integer number (501216).

Almost surely, 2^3661559 is an apocalyptic number.

3661559 is a deficient number, since it is larger than the sum of its proper divisors (348169).

3661559 is a wasteful number, since it uses less digits than its factorization.

3661559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285.

The product of its digits is 24300, while the sum is 35.

The square root of 3661559 is about 1913.5200547682. The cubic root of 3661559 is about 154.1305324940.

The spelling of 3661559 in words is "three million, six hundred sixty-one thousand, five hundred fifty-nine".