3643651 has 4 divisors (see below), whose sum is σ = 3974904. Its totient is φ = 3312400.

The previous prime is 3643639. The next prime is 3643657. The reversal of 3643651 is 1563463.

3643651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3643651 - 2⁹ = 3643139 is a prime.

It is an Ulam number.

It is a pancake number, because a pancake can be divided into 3643651 parts by 2699 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165610 + ... + 165631.

It is an arithmetic number, because the mean of its divisors is an integer number (993726).

Almost surely, 2^3643651 is an apocalyptic number.

3643651 is a deficient number, since it is larger than the sum of its proper divisors (331253).

3643651 is a wasteful number, since it uses less digits than its factorization.

3643651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331252.

The product of its digits is 6480, while the sum is 28.

The square root of 3643651 is about 1908.8349850105. The cubic root of 3643651 is about 153.8788471994.

The spelling of 3643651 in words is "three million, six hundred forty-three thousand, six hundred fifty-one".