4815581 has 2 divisors, whose sum is σ = 4815582. Its totient is φ = 4815580.

The previous prime is 4815553. The next prime is 4815583. The reversal of 4815581 is 1855184.

4815581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3363556 + 1452025 = 1834^2 + 1205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4815581 is a prime.

It is a super-2 number, since 2×4815581² = 46379640735122, which contains 22 as substring.

Together with 4815583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4815583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2407790 + 2407791.

It is an arithmetic number, because the mean of its divisors is an integer number (2407791).

Almost surely, 2^4815581 is an apocalyptic number.

It is an amenable number.

4815581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4815581 is an equidigital number, since it uses as much as digits as its factorization.

4815581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 32.

The square root of 4815581 is about 2194.4432095636. The cubic root of 4815581 is about 168.8688570969.

The spelling of 4815581 in words is "four million, eight hundred fifteen thousand, five hundred eighty-one".