3771661 has 2 divisors, whose sum is σ = 3771662. Its totient is φ = 3771660.

The previous prime is 3771641. The next prime is 3771667. The reversal of 3771661 is 1661773.

3771661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3515625 + 256036 = 1875^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 3771661 - 2¹¹ = 3769613 is a prime.

It is a super-3 number, since 3×3771661³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3771667) 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 as a sum of consecutive naturals, namely, 1885830 + 1885831.

It is an arithmetic number, because the mean of its divisors is an integer number (1885831).

Almost surely, 2^3771661 is an apocalyptic number.

It is an amenable number.

3771661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3771661 is an equidigital number, since it uses as much as digits as its factorization.

3771661 is an odious number, because the sum of its binary digits is odd.

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

The square root of 3771661 is about 1942.0764660538. The cubic root of 3771661 is about 155.6601879002.

The spelling of 3771661 in words is "three million, seven hundred seventy-one thousand, six hundred sixty-one".