3693661 has 2 divisors, whose sum is σ = 3693662. Its totient is φ = 3693660.

The previous prime is 3693659. The next prime is 3693689. The reversal of 3693661 is 1663963.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2910436 + 783225 = 1706^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 3693661 - 2¹ = 3693659 is a prime.

Together with 3693659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3693601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1846830 + 1846831.

It is an arithmetic number, because the mean of its divisors is an integer number (1846831).

Almost surely, 2^3693661 is an apocalyptic number.

It is an amenable number.

3693661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3693661 is an equidigital number, since it uses as much as digits as its factorization.

3693661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 34.

The square root of 3693661 is about 1921.8899552264. The cubic root of 3693661 is about 154.5796588967.

The spelling of 3693661 in words is "three million, six hundred ninety-three thousand, six hundred sixty-one".