3651601 has 4 divisors (see below), whose sum is σ = 3703104. Its totient is φ = 3600100.

The previous prime is 3651559. The next prime is 3651607. The reversal of 3651601 is 1061563.

3651601 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1061563 = 359 ⋅2957.

It is a cyclic number.

It is not a de Polignac number, because 3651601 - 2¹⁵ = 3618833 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3651607) 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, 25645 + ... + 25786.

It is an arithmetic number, because the mean of its divisors is an integer number (925776).

Almost surely, 2^3651601 is an apocalyptic number.

It is an amenable number.

3651601 is a deficient number, since it is larger than the sum of its proper divisors (51503).

3651601 is an equidigital number, since it uses as much as digits as its factorization.

3651601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51502.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 3651601 is about 1910.9162723678. The cubic root of 3651601 is about 153.9906808326.

The spelling of 3651601 in words is "three million, six hundred fifty-one thousand, six hundred one".