13525721 has 8 divisors (see below), whose sum is σ = 14792544. Its totient is φ = 12265120.

The previous prime is 13525717. The next prime is 13525723. The reversal of 13525721 is 12752531.

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

It is a cyclic number.

It is not a de Polignac number, because 13525721 - 2² = 13525717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13525723) 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 7 ways as a sum of consecutive naturals, for example, 3821 + ... + 6453.

It is an arithmetic number, because the mean of its divisors is an integer number (1849068).

Almost surely, 2^13525721 is an apocalyptic number.

13525721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13525721 is a deficient number, since it is larger than the sum of its proper divisors (1266823).

13525721 is a wasteful number, since it uses less digits than its factorization.

13525721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111.

The product of its digits is 2100, while the sum is 26.

The square root of 13525721 is about 3677.7331333309. The cubic root of 13525721 is about 238.2612823863.

The spelling of 13525721 in words is "thirteen million, five hundred twenty-five thousand, seven hundred twenty-one".