3920981961 has 16 divisors (see below), whose sum is σ = 5761063616. Its totient is φ = 2356796736.

The previous prime is 3920981947. The next prime is 3920982007. The reversal of 3920981961 is 1691890293.

It is not a de Polignac number, because 3920981961 - 2¹⁰ = 3920980937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3920981961.

It is not an unprimeable number, because it can be changed into a prime (3920981161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1167370 + ... + 1170723.

It is an arithmetic number, because the mean of its divisors is an integer number (360066476).

Almost surely, 2^3920981961 is an apocalyptic number.

It is an amenable number.

3920981961 is a deficient number, since it is larger than the sum of its proper divisors (1840081655).

3920981961 is a wasteful number, since it uses less digits than its factorization.

3920981961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338152.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 3920981961 is about 62617.7447773393. The cubic root of 3920981961 is about 1576.8786801404.

The spelling of 3920981961 in words is "three billion, nine hundred twenty million, nine hundred eighty-one thousand, nine hundred sixty-one".