13315985 has 16 divisors (see below), whose sum is σ = 16465680. Its totient is φ = 10333440.

The previous prime is 13315969. The next prime is 13315987. The reversal of 13315985 is 58951331.

It can be written as a sum of positive squares in 8 ways, for example, as 37249 + 13278736 = 193^2 + 3644^2 .

It is not a de Polignac number, because 13315985 - 2⁴ = 13315969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13315987) 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 15 ways as a sum of consecutive naturals, for example, 28655 + ... + 29115.

It is an arithmetic number, because the mean of its divisors is an integer number (1029105).

Almost surely, 2^13315985 is an apocalyptic number.

It is an amenable number.

13315985 is a deficient number, since it is larger than the sum of its proper divisors (3149695).

13315985 is a wasteful number, since it uses less digits than its factorization.

13315985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its digits is 16200, while the sum is 35.

The square root of 13315985 is about 3649.1074251110. The cubic root of 13315985 is about 237.0233320451.

The spelling of 13315985 in words is "thirteen million, three hundred fifteen thousand, nine hundred eighty-five".