4081581581 has 8 divisors (see below), whose sum is σ = 5088725184. Its totient is φ = 3180453120.

The previous prime is 4081581571. The next prime is 4081581619. The reversal of 4081581581 is 1851851804.

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 4081581581 - 2¹⁴ = 4081565197 is a prime.

It is a super-2 number, since 2×4081581581² = 33318616404716919122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4081581571) 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, 26503700 + ... + 26503853.

It is an arithmetic number, because the mean of its divisors is an integer number (636090648).

Almost surely, 2^4081581581 is an apocalyptic number.

It is an amenable number.

4081581581 is a deficient number, since it is larger than the sum of its proper divisors (1007143603).

4081581581 is a wasteful number, since it uses less digits than its factorization.

4081581581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53007571.

The product of its (nonzero) digits is 51200, while the sum is 41.

The square root of 4081581581 is about 63887.2567966414. The cubic root of 4081581581 is about 1598.1203944843.

The spelling of 4081581581 in words is "four billion, eighty-one million, five hundred eighty-one thousand, five hundred eighty-one".