3669561 has 36 divisors (see below), whose sum is σ = 6322212. Its totient is φ = 2044224.

The previous prime is 3669557. The next prime is 3669583. The reversal of 3669561 is 1659663.

3669561 is a `hidden beast` number, since 36 + 69 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1863225 + 1806336 = 1365^2 + 1344^2 .

It is not a de Polignac number, because 3669561 - 2² = 3669557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3669511) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23295 + ... + 23451.

It is an arithmetic number, because the mean of its divisors is an integer number (175617).

Almost surely, 2^3669561 is an apocalyptic number.

It is an amenable number.

3669561 is a deficient number, since it is larger than the sum of its proper divisors (2652651).

3669561 is a wasteful number, since it uses less digits than its factorization.

3669561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 220 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 3669561 is about 1915.6098245728. The cubic root of 3669561 is about 154.2427301627.

The spelling of 3669561 in words is "three million, six hundred sixty-nine thousand, five hundred sixty-one".