104169781 has 4 divisors (see below), whose sum is σ = 104203372. Its totient is φ = 104136192.

The previous prime is 104169773. The next prime is 104169803. The reversal of 104169781 is 187961401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12489156 + 91680625 = 3534^2 + 9575^2 .

It is a cyclic number.

It is not a de Polignac number, because 104169781 - 2³ = 104169773 is a prime.

It is a super-2 number, since 2×104169781² = 21702686547175922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 104169781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104169721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11610 + ... + 18523.

It is an arithmetic number, because the mean of its divisors is an integer number (26050843).

Almost surely, 2^104169781 is an apocalyptic number.

It is an amenable number.

104169781 is a deficient number, since it is larger than the sum of its proper divisors (33591).

104169781 is an equidigital number, since it uses as much as digits as its factorization.

104169781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33590.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 104169781 is about 10206.3598310073. The cubic root of 104169781 is about 470.5227035136.

The spelling of 104169781 in words is "one hundred four million, one hundred sixty-nine thousand, seven hundred eighty-one".