104156809 has 4 divisors (see below), whose sum is σ = 104192404. Its totient is φ = 104121216.

The previous prime is 104156797. The next prime is 104156821. The reversal of 104156809 is 908651401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908651401 = 7 ⋅129807343.

It is an interprime number because it is at equal distance from previous prime (104156797) and next prime (104156821).

It can be written as a sum of positive squares in 2 ways, for example, as 82301184 + 21855625 = 9072^2 + 4675^2 .

It is a cyclic number.

It is not a de Polignac number, because 104156809 - 2¹³ = 104148617 is a prime.

It is a super-2 number, since 2×104156809² = 21697281722124962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (104156849) 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 in 3 ways as a sum of consecutive naturals, for example, 12972 + ... + 19405.

It is an arithmetic number, because the mean of its divisors is an integer number (26048101).

Almost surely, 2^104156809 is an apocalyptic number.

It is an amenable number.

104156809 is a deficient number, since it is larger than the sum of its proper divisors (35595).

104156809 is an equidigital number, since it uses as much as digits as its factorization.

104156809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35594.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 104156809 is about 10205.7243251030. The cubic root of 104156809 is about 470.5031717011.

The spelling of 104156809 in words is "one hundred four million, one hundred fifty-six thousand, eight hundred nine".