3961964691 has 16 divisors (see below), whose sum is σ = 5881360000. Its totient is φ = 2636007624.

The previous prime is 3961964689. The next prime is 3961964707. The reversal of 3961964691 is 1964691693.

3961964691 is a `hidden beast` number, since 3 + 96 + 1 + 96 + 469 + 1 = 666.

It is not a de Polignac number, because 3961964691 - 2¹ = 3961964689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3961964651) 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, 133561 + ... + 160506.

It is an arithmetic number, because the mean of its divisors is an integer number (367585000).

Almost surely, 2^3961964691 is an apocalyptic number.

3961964691 is a deficient number, since it is larger than the sum of its proper divisors (1919395309).

3961964691 is a wasteful number, since it uses less digits than its factorization.

3961964691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294575 (or 294569 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 3961964691 is about 62944.1394491973. The cubic root of 3961964691 is about 1582.3535786901.

The spelling of 3961964691 in words is "three billion, nine hundred sixty-one million, nine hundred sixty-four thousand, six hundred ninety-one".