3961693581 has 8 divisors (see below), whose sum is σ = 5511921600. Its totient is φ = 2526297312.

The previous prime is 3961693573. The next prime is 3961693613. The reversal of 3961693581 is 1853961693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3961693581 - 2³ = 3961693573 is a prime.

It is a super-2 number, since 2×3961693581² = 31390032059473207122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3961793581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28707856 + ... + 28707993.

It is an arithmetic number, because the mean of its divisors is an integer number (688990200).

Almost surely, 2^3961693581 is an apocalyptic number.

It is an amenable number.

3961693581 is a deficient number, since it is larger than the sum of its proper divisors (1550228019).

3961693581 is a wasteful number, since it uses less digits than its factorization.

3961693581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57415875.

The product of its digits is 1049760, while the sum is 51.

The square root of 3961693581 is about 62941.9858361650. The cubic root of 3961693581 is about 1582.3174853461.

The spelling of 3961693581 in words is "three billion, nine hundred sixty-one million, six hundred ninety-three thousand, five hundred eighty-one".