13531985 has 8 divisors (see below), whose sum is σ = 16406376. Its totient is φ = 10713600.

The previous prime is 13531979. The next prime is 13531993. The reversal of 13531985 is 58913531.

It can be written as a sum of positive squares in 4 ways, for example, as 3489424 + 10042561 = 1868^2 + 3169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13531985 - 2¹² = 13527889 is a prime.

It is a super-2 number, since 2×13531985² = 366229236080450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13466 + ... + 14435.

It is an arithmetic number, because the mean of its divisors is an integer number (2050797).

Almost surely, 2^13531985 is an apocalyptic number.

It is an amenable number.

13531985 is a deficient number, since it is larger than the sum of its proper divisors (2874391).

13531985 is an equidigital number, since it uses as much as digits as its factorization.

13531985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28003.

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

The square root of 13531985 is about 3678.5846463008. The cubic root of 13531985 is about 238.2980577108.

The spelling of 13531985 in words is "thirteen million, five hundred thirty-one thousand, nine hundred eighty-five".