3664561 has 2 divisors, whose sum is σ = 3664562. Its totient is φ = 3664560.

The previous prime is 3664547. The next prime is 3664631. The reversal of 3664561 is 1654663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 1547536 = 1455^2 + 1244^2 .

It is an emirp because it is prime and its reverse (1654663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3664561 - 2¹³ = 3656369 is a prime.

It is not a weakly prime, because it can be changed into another prime (3664361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1832280 + 1832281.

It is an arithmetic number, because the mean of its divisors is an integer number (1832281).

Almost surely, 2^3664561 is an apocalyptic number.

It is an amenable number.

3664561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3664561 is an equidigital number, since it uses as much as digits as its factorization.

3664561 is an evil number, because the sum of its binary digits is even.

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

The square root of 3664561 is about 1914.3043122764. The cubic root of 3664561 is about 154.1726432875.

It can be divided in two parts, 3664 and 561, that added together give a square (4225 = 65²).

The spelling of 3664561 in words is "three million, six hundred sixty-four thousand, five hundred sixty-one".