3661191 has 12 divisors (see below), whose sum is σ = 5308680. Its totient is φ = 2431440.

The previous prime is 3661181. The next prime is 3661211. The reversal of 3661191 is 1911663.

It is not a de Polignac number, because 3661191 - 2¹¹ = 3659143 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661111) 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, 2365 + ... + 3593.

It is an arithmetic number, because the mean of its divisors is an integer number (442390).

Almost surely, 2^3661191 is an apocalyptic number.

3661191 is a deficient number, since it is larger than the sum of its proper divisors (1647489).

3661191 is a wasteful number, since it uses less digits than its factorization.

3661191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566 (or 1563 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 3661191 is about 1913.4238944886. The cubic root of 3661191 is about 154.1253687612.

The spelling of 3661191 in words is "three million, six hundred sixty-one thousand, one hundred ninety-one".