13017905 has 4 divisors (see below), whose sum is σ = 15621492. Its totient is φ = 10414320.

The previous prime is 13017889. The next prime is 13017929. The reversal of 13017905 is 50971031.

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 9265936 + 3751969 = 3044^2 + 1937^2 .

It is not a de Polignac number, because 13017905 - 2⁴ = 13017889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1301786 + ... + 1301795.

It is an arithmetic number, because the mean of its divisors is an integer number (3905373).

Almost surely, 2^13017905 is an apocalyptic number.

It is an amenable number.

13017905 is a deficient number, since it is larger than the sum of its proper divisors (2603587).

13017905 is an equidigital number, since it uses as much as digits as its factorization.

13017905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603586.

The product of its (nonzero) digits is 945, while the sum is 26.

The square root of 13017905 is about 3608.0333978499. The cubic root of 13017905 is about 235.2413696281.

Adding to 13017905 its reverse (50971031), we get a palindrome (63988936).

The spelling of 13017905 in words is "thirteen million, seventeen thousand, nine hundred five".