8345581 has 2 divisors, whose sum is σ = 8345582. Its totient is φ = 8345580.

The previous prime is 8345549. The next prime is 8345599. The reversal of 8345581 is 1855438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7209225 + 1136356 = 2685^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 8345581 - 2⁵ = 8345549 is a prime.

It is a super-2 number, since 2×8345581² = 139297444455122, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8345501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4172790 + 4172791.

It is an arithmetic number, because the mean of its divisors is an integer number (4172791).

Almost surely, 2^8345581 is an apocalyptic number.

It is an amenable number.

8345581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8345581 is an equidigital number, since it uses as much as digits as its factorization.

8345581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 34.

The square root of 8345581 is about 2888.8719251639. The cubic root of 8345581 is about 202.8393416096.

The spelling of 8345581 in words is "eight million, three hundred forty-five thousand, five hundred eighty-one".