3671581 has 4 divisors (see below), whose sum is σ = 3685500. Its totient is φ = 3657664.

The previous prime is 3671573. The next prime is 3671587. The reversal of 3671581 is 1851763.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 308025 + 3363556 = 555^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 3671581 - 2³ = 3671573 is a prime.

It is a super-2 number, since 2×3671581² = 26961014079122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3671587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6556 + ... + 7093.

It is an arithmetic number, because the mean of its divisors is an integer number (921375).

Almost surely, 2^3671581 is an apocalyptic number.

It is an amenable number.

3671581 is a deficient number, since it is larger than the sum of its proper divisors (13919).

3671581 is a wasteful number, since it uses less digits than its factorization.

3671581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13918.

The product of its digits is 5040, while the sum is 31.

The square root of 3671581 is about 1916.1369992775. The cubic root of 3671581 is about 154.2710272044.

It can be divided in two parts, 36 and 71581, that added together give a palindrome (71617).

The spelling of 3671581 in words is "three million, six hundred seventy-one thousand, five hundred eighty-one".