3657561 has 16 divisors (see below), whose sum is σ = 5081664. Its totient is φ = 2337984.

The previous prime is 3657547. The next prime is 3657571. The reversal of 3657561 is 1657563.

It is not a de Polignac number, because 3657561 - 2⁶ = 3657497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3657571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9015 + ... + 9411.

It is an arithmetic number, because the mean of its divisors is an integer number (317604).

Almost surely, 2^3657561 is an apocalyptic number.

It is an amenable number.

3657561 is a deficient number, since it is larger than the sum of its proper divisors (1424103).

3657561 is a wasteful number, since it uses less digits than its factorization.

3657561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520.

The product of its digits is 18900, while the sum is 33.

The square root of 3657561 is about 1912.4750978771. The cubic root of 3657561 is about 154.0744144777.

The spelling of 3657561 in words is "three million, six hundred fifty-seven thousand, five hundred sixty-one".