3891358081 has 8 divisors (see below), whose sum is σ = 4192662824. Its totient is φ = 3590334720.

The previous prime is 3891358073. The next prime is 3891358147. The reversal of 3891358081 is 1808531983.

It can be written as a sum of positive squares in 4 ways, for example, as 108493056 + 3782865025 = 10416^2 + 61505^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3891358081 - 2³ = 3891358073 is a prime.

It is a super-2 number, since 2×3891358081² = 30285335429128005122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3891358181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41166 + ... + 97351.

It is an arithmetic number, because the mean of its divisors is an integer number (524082853).

Almost surely, 2^3891358081 is an apocalyptic number.

It is an amenable number.

3891358081 is a deficient number, since it is larger than the sum of its proper divisors (301304743).

3891358081 is a wasteful number, since it uses less digits than its factorization.

3891358081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140691.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 3891358081 is about 62380.7508851889. The cubic root of 3891358081 is about 1572.8974151969.

The spelling of 3891358081 in words is "three billion, eight hundred ninety-one million, three hundred fifty-eight thousand, eighty-one".