3649661 has 4 divisors (see below), whose sum is σ = 3767424. Its totient is φ = 3531900.

The previous prime is 3649637. The next prime is 3649669. The reversal of 3649661 is 1669463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3649661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649669) 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, 58835 + ... + 58896.

It is an arithmetic number, because the mean of its divisors is an integer number (941856).

Almost surely, 2^3649661 is an apocalyptic number.

3649661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3649661 is a deficient number, since it is larger than the sum of its proper divisors (117763).

3649661 is a wasteful number, since it uses less digits than its factorization.

3649661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117762.

The product of its digits is 23328, while the sum is 35.

The square root of 3649661 is about 1910.4085950393. The cubic root of 3649661 is about 153.9634055962.

The spelling of 3649661 in words is "three million, six hundred forty-nine thousand, six hundred sixty-one".