13531913 has 4 divisors (see below), whose sum is σ = 13551108. Its totient is φ = 13512720.

The previous prime is 13531891. The next prime is 13531919. The reversal of 13531913 is 31913531.

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 7246864 + 6285049 = 2692^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 13531913 - 2⁶ = 13531849 is a prime.

It is a super-2 number, since 2×13531913² = 366225338879138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531919) 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 3 ways as a sum of consecutive naturals, for example, 8498 + ... + 9963.

It is an arithmetic number, because the mean of its divisors is an integer number (3387777).

Almost surely, 2^13531913 is an apocalyptic number.

It is an amenable number.

13531913 is a deficient number, since it is larger than the sum of its proper divisors (19195).

13531913 is an equidigital number, since it uses as much as digits as its factorization.

13531913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19194.

The product of its digits is 1215, while the sum is 26.

The square root of 13531913 is about 3678.5748599152. The cubic root of 13531913 is about 238.2976350704.

The spelling of 13531913 in words is "thirteen million, five hundred thirty-one thousand, nine hundred thirteen".