12345581 has 2 divisors, whose sum is σ = 12345582. Its totient is φ = 12345580.

The previous prime is 12345577. The next prime is 12345623. The reversal of 12345581 is 18554321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9424900 + 2920681 = 3070^2 + 1709^2 .

It is a cyclic number.

It is not a de Polignac number, because 12345581 - 2² = 12345577 is a prime.

It is a super-2 number, since 2×12345581² = 304826740455122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12345511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6172790 + 6172791.

It is an arithmetic number, because the mean of its divisors is an integer number (6172791).

Almost surely, 2^12345581 is an apocalyptic number.

It is an amenable number.

12345581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12345581 is an equidigital number, since it uses as much as digits as its factorization.

12345581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 12345581 is about 3513.6278972025. The cubic root of 12345581 is about 231.1198131602.

The spelling of 12345581 in words is "twelve million, three hundred forty-five thousand, five hundred eighty-one".