3717661 has 4 divisors (see below), whose sum is σ = 3764800. Its totient is φ = 3670524.

The previous prime is 3717647. The next prime is 3717667. The reversal of 3717661 is 1667173.

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 not a de Polignac number, because 3717661 - 2⁷ = 3717533 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 (3717667) 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, 23451 + ... + 23608.

It is an arithmetic number, because the mean of its divisors is an integer number (941200).

Almost surely, 2^3717661 is an apocalyptic number.

It is an amenable number.

3717661 is a deficient number, since it is larger than the sum of its proper divisors (47139).

3717661 is an equidigital number, since it uses as much as digits as its factorization.

3717661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47138.

The product of its digits is 5292, while the sum is 31.

The square root of 3717661 is about 1928.1236993513. The cubic root of 3717661 is about 154.9137362522.

The spelling of 3717661 in words is "three million, seven hundred seventeen thousand, six hundred sixty-one".