3615561 has 12 divisors (see below), whose sum is σ = 5391360. Its totient is φ = 2332440.

The previous prime is 3615559. The next prime is 3615571. The reversal of 3615561 is 1655163.

It is a happy number.

It is not a de Polignac number, because 3615561 - 2¹ = 3615559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3615571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6201 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (449280).

Almost surely, 2^3615561 is an apocalyptic number.

3615561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3615561 is a deficient number, since it is larger than the sum of its proper divisors (1775799).

3615561 is a wasteful number, since it uses less digits than its factorization.

3615561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12996 (or 12993 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 3615561 is about 1901.4628579070. The cubic root of 3615561 is about 153.4823939036.

The spelling of 3615561 in words is "three million, six hundred fifteen thousand, five hundred sixty-one".