3081581 has 2 divisors, whose sum is σ = 3081582. Its totient is φ = 3081580.

The previous prime is 3081577. The next prime is 3081583. The reversal of 3081581 is 1851803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2788900 + 292681 = 1670^2 + 541^2 .

It is an emirp because it is prime and its reverse (1851803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3081581 - 2² = 3081577 is a prime.

It is a super-2 number, since 2×3081581² = 18992282919122, which contains 22 as substring.

Together with 3081583, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3081581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3081583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1540790 + 1540791.

It is an arithmetic number, because the mean of its divisors is an integer number (1540791).

Almost surely, 2^3081581 is an apocalyptic number.

It is an amenable number.

3081581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3081581 is an equidigital number, since it uses as much as digits as its factorization.

3081581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 3081581 is about 1755.4432488691. The cubic root of 3081581 is about 145.5206176032.

The spelling of 3081581 in words is "three million, eighty-one thousand, five hundred eighty-one".