3639091 has 4 divisors (see below), whose sum is σ = 3647512. Its totient is φ = 3630672.

The previous prime is 3639079. The next prime is 3639107. The reversal of 3639091 is 1909363.

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

It is a cyclic number.

It is not a de Polignac number, because 3639091 - 2¹¹ = 3637043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3639991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525 + ... + 4438.

It is an arithmetic number, because the mean of its divisors is an integer number (911878).

Almost surely, 2^3639091 is an apocalyptic number.

3639091 is a deficient number, since it is larger than the sum of its proper divisors (8421).

3639091 is an equidigital number, since it uses as much as digits as its factorization.

3639091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8420.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 3639091 is about 1907.6401652303. The cubic root of 3639091 is about 153.8146276875.

It can be divided in two parts, 36390 and 91, that added together give a square (36481 = 191²).

The spelling of 3639091 in words is "three million, six hundred thirty-nine thousand, ninety-one".