3581393881 has 4 divisors (see below), whose sum is σ = 3856885732. Its totient is φ = 3305902032.

The previous prime is 3581393867. The next prime is 3581393891. The reversal of 3581393881 is 1883931853.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1883931853 = 1097 ⋅1717349.

It can be written as a sum of positive squares in 2 ways, for example, as 1015059600 + 2566334281 = 31860^2 + 50659^2 .

It is a cyclic number.

It is not a de Polignac number, because 3581393881 - 2⁹ = 3581393369 is a prime.

It is a super-2 number, since 2×3581393881² = 25652764261728484322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3581393861) 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, 137745906 + ... + 137745931.

It is an arithmetic number, because the mean of its divisors is an integer number (964221433).

Almost surely, 2^3581393881 is an apocalyptic number.

It is an amenable number.

3581393881 is a deficient number, since it is larger than the sum of its proper divisors (275491851).

3581393881 is a wasteful number, since it uses less digits than its factorization.

3581393881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275491850.

The product of its digits is 622080, while the sum is 49.

The square root of 3581393881 is about 59844.7481488560. The cubic root of 3581393881 is about 1529.9739242569.

The spelling of 3581393881 in words is "three billion, five hundred eighty-one million, three hundred ninety-three thousand, eight hundred eighty-one".