3961146209 has 4 divisors (see below), whose sum is σ = 3976927920. Its totient is φ = 3945364500.

The previous prime is 3961146187. The next prime is 3961146247. The reversal of 3961146209 is 9026411693.

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 a de Polignac number, because none of the positive numbers 2^k-3961146209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3961146269) 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, 7890479 + ... + 7890980.

It is an arithmetic number, because the mean of its divisors is an integer number (994231980).

Almost surely, 2^3961146209 is an apocalyptic number.

It is an amenable number.

3961146209 is a deficient number, since it is larger than the sum of its proper divisors (15781711).

3961146209 is a wasteful number, since it uses less digits than its factorization.

3961146209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15781710.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 3961146209 is about 62937.6374596314. The cubic root of 3961146209 is about 1582.2446077445.

The spelling of 3961146209 in words is "three billion, nine hundred sixty-one million, one hundred forty-six thousand, two hundred nine".