3661281 has 48 divisors (see below), whose sum is σ = 6319040. Its totient is φ = 2099520.

The previous prime is 3661277. The next prime is 3661289. The reversal of 3661281 is 1821663.

It is not a de Polignac number, because 3661281 - 2² = 3661277 is a prime.

It is a super-2 number, since 2×3661281² = 26809957121922, which contains 22 as substring.

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

Its product of digits (1728) is a multiple of the sum of its prime divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661289) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59991 + ... + 60051.

Almost surely, 2^3661281 is an apocalyptic number.

It is an amenable number.

3661281 is a deficient number, since it is larger than the sum of its proper divisors (2657759).

3661281 is a wasteful number, since it uses less digits than its factorization.

3661281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 96 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 3661281 is about 1913.4474123947. The cubic root of 3661281 is about 154.1266316626.

The spelling of 3661281 in words is "three million, six hundred sixty-one thousand, two hundred eighty-one".