13537969 has 4 divisors (see below), whose sum is σ = 13558644. Its totient is φ = 13517296.

The previous prime is 13537957. The next prime is 13537973. The reversal of 13537969 is 96973531.

It is a happy number.

13537969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12873744 + 664225 = 3588^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 13537969 - 2⁷ = 13537841 is a prime.

It is a super-2 number, since 2×13537969² = 366553209289922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13537919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9322 + ... + 10675.

It is an arithmetic number, because the mean of its divisors is an integer number (3389661).

Almost surely, 2^13537969 is an apocalyptic number.

It is an amenable number.

13537969 is a deficient number, since it is larger than the sum of its proper divisors (20675).

13537969 is an equidigital number, since it uses as much as digits as its factorization.

13537969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20674.

The product of its digits is 153090, while the sum is 43.

The square root of 13537969 is about 3679.3979127026. The cubic root of 13537969 is about 238.3331785851. Note that the first 3 decimals are identical.

The spelling of 13537969 in words is "thirteen million, five hundred thirty-seven thousand, nine hundred sixty-nine".