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3645661 = 23158507
BaseRepresentation
bin1101111010000011011101
320212012220111
431322003131
51413130121
6210050021
742662515
oct15720335
96765814
103645661
112070048
121279911
139a84c6
146ac845
154c02e1
hex37a0dd

3645661 has 4 divisors (see below), whose sum is σ = 3804192. Its totient is φ = 3487132.

The previous prime is 3645659. The next prime is 3645683. The reversal of 3645661 is 1665463.

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: 1665463 = 5692927.

It is a cyclic number.

It is not a de Polignac number, because 3645661 - 21 = 3645659 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645611) 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, 79231 + ... + 79276.

It is an arithmetic number, because the mean of its divisors is an integer number (951048).

Almost surely, 23645661 is an apocalyptic number.

It is an amenable number.

3645661 is a deficient number, since it is larger than the sum of its proper divisors (158531).

3645661 is a wasteful number, since it uses less digits than its factorization.

3645661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158530.

The product of its digits is 12960, while the sum is 31.

The square root of 3645661 is about 1909.3614115719. The cubic root of 3645661 is about 153.9071374707.

The spelling of 3645661 in words is "three million, six hundred forty-five thousand, six hundred sixty-one".

Divisors: 1 23 158507 3645661