3661851 has 16 divisors (see below), whose sum is σ = 5443200. Its totient is φ = 2176128.

The previous prime is 3661841. The next prime is 3661871. The reversal of 3661851 is 1581663.

It is not a de Polignac number, because 3661851 - 2¹⁰ = 3660827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3661831) 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, 921 + ... + 2858.

It is an arithmetic number, because the mean of its divisors is an integer number (340200).

Almost surely, 2^3661851 is an apocalyptic number.

3661851 is a deficient number, since it is larger than the sum of its proper divisors (1781349).

3661851 is a wasteful number, since it uses less digits than its factorization.

3661851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818.

The product of its digits is 4320, while the sum is 30.

The square root of 3661851 is about 1913.5963524213. The cubic root of 3661851 is about 154.1346295575.

The spelling of 3661851 in words is "three million, six hundred sixty-one thousand, eight hundred fifty-one".