3943620961 has 4 divisors (see below), whose sum is σ = 4506995392. Its totient is φ = 3380246532.

The previous prime is 3943620953. The next prime is 3943620991. The reversal of 3943620961 is 1690263493.

3943620961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1690263493 = 5309 ⋅318377.

It is a cyclic number.

It is not a de Polignac number, because 3943620961 - 2³ = 3943620953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3943620931) 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, 281687205 + ... + 281687218.

It is an arithmetic number, because the mean of its divisors is an integer number (1126748848).

Almost surely, 2^3943620961 is an apocalyptic number.

It is an amenable number.

3943620961 is a deficient number, since it is larger than the sum of its proper divisors (563374431).

3943620961 is an equidigital number, since it uses as much as digits as its factorization.

3943620961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563374430.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 3943620961 is about 62798.2560347021. The cubic root of 3943620961 is about 1579.9077232067.

The spelling of 3943620961 in words is "three billion, nine hundred forty-three million, six hundred twenty thousand, nine hundred sixty-one".