104163581 has 2 divisors, whose sum is σ = 104163582. Its totient is φ = 104163580.

The previous prime is 104163487. The next prime is 104163611. The reversal of 104163581 is 185361401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101324356 + 2839225 = 10066^2 + 1685^2 .

It is an emirp because it is prime and its reverse (185361401) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-104163581 is a prime.

It is a super-2 number, since 2×104163581² = 21700103213487122, 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 (104163281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52081790 + 52081791.

It is an arithmetic number, because the mean of its divisors is an integer number (52081791).

Almost surely, 2^104163581 is an apocalyptic number.

It is an amenable number.

104163581 is a deficient number, since it is larger than the sum of its proper divisors (1).

104163581 is an equidigital number, since it uses as much as digits as its factorization.

104163581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 104163581 is about 10206.0560943001. The cubic root of 104163581 is about 470.5133684370.

The spelling of 104163581 in words is "one hundred four million, one hundred sixty-three thousand, five hundred eighty-one".