3961394641 has 4 divisors (see below), whose sum is σ = 3986626612. Its totient is φ = 3936162672.

The previous prime is 3961394623. The next prime is 3961394687. The reversal of 3961394641 is 1464931693.

3961394641 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 an emirpimes, since its reverse is a distinct semiprime: 1464931693 = 163 ⋅8987311.

It can be written as a sum of positive squares in 2 ways, for example, as 2335692241 + 1625702400 = 48329^2 + 40320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3961394641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3961394591 and 3961394600.

It is not an unprimeable number, because it can be changed into a prime (3961394611) 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, 12615750 + ... + 12616063.

It is an arithmetic number, because the mean of its divisors is an integer number (996656653).

Almost surely, 2^3961394641 is an apocalyptic number.

It is an amenable number.

3961394641 is a deficient number, since it is larger than the sum of its proper divisors (25231971).

3961394641 is a wasteful number, since it uses less digits than its factorization.

3961394641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25231970.

The product of its digits is 419904, while the sum is 46.

The square root of 3961394641 is about 62939.6110648930. The cubic root of 3961394641 is about 1582.2776850370.

The spelling of 3961394641 in words is "three billion, nine hundred sixty-one million, three hundred ninety-four thousand, six hundred forty-one".