3645081 has 20 divisors (see below), whose sum is σ = 5941584. Its totient is φ = 2208600.

The previous prime is 3645077. The next prime is 3645101. The reversal of 3645081 is 1805463.

It is not a de Polignac number, because 3645081 - 2² = 3645077 is a prime.

It is a super-2 number, since 2×3645081² = 26573230993122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (3645071) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1155 + ... + 2936.

Almost surely, 2^3645081 is an apocalyptic number.

It is an amenable number.

3645081 is a deficient number, since it is larger than the sum of its proper divisors (2296503).

3645081 is a wasteful number, since it uses less digits than its factorization.

3645081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114 (or 4105 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 3645081 is about 1909.2095222893. The cubic root of 3645081 is about 153.8989751764.

It can be divided in two parts, 364 and 5081, that added together give a palindrome (5445).

The spelling of 3645081 in words is "three million, six hundred forty-five thousand, eighty-one".