104431521065 has 4 divisors (see below), whose sum is σ = 125317825284. Its totient is φ = 83545216848.

The previous prime is 104431521037. The next prime is 104431521071. The reversal of 104431521065 is 560125134401.

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 52672086016 + 51759435049 = 229504^2 + 227507^2 .

It is a cyclic number.

It is not a de Polignac number, because 104431521065 - 2²² = 104427326761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10443152102 + ... + 10443152111.

It is an arithmetic number, because the mean of its divisors is an integer number (31329456321).

Almost surely, 2^104431521065 is an apocalyptic number.

It is an amenable number.

104431521065 is a deficient number, since it is larger than the sum of its proper divisors (20886304219).

104431521065 is an equidigital number, since it uses as much as digits as its factorization.

104431521065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20886304218.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 104431521065 its reverse (560125134401), we get a palindrome (664556655466).

The spelling of 104431521065 in words is "one hundred four billion, four hundred thirty-one million, five hundred twenty-one thousand, sixty-five".