3909471661 has 4 divisors (see below), whose sum is σ = 3910122112. Its totient is φ = 3908821212.

The previous prime is 3909471653. The next prime is 3909471677. The reversal of 3909471661 is 1661749093.

It is a happy number.

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 3909471661 - 2³ = 3909471653 is a prime.

It is a super-3 number, since 3×3909471661³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909471361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316125 + ... + 328258.

It is an arithmetic number, because the mean of its divisors is an integer number (977530528).

Almost surely, 2^3909471661 is an apocalyptic number.

It is an amenable number.

3909471661 is a deficient number, since it is larger than the sum of its proper divisors (650451).

3909471661 is an equidigital number, since it uses as much as digits as its factorization.

3909471661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650450.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 3909471661 is about 62525.7679760913. The cubic root of 3909471661 is about 1575.3341575024.

The spelling of 3909471661 in words is "three billion, nine hundred nine million, four hundred seventy-one thousand, six hundred sixty-one".