15664241 has 4 divisors (see below), whose sum is σ = 15681252. Its totient is φ = 15647232.

The previous prime is 15664237. The next prime is 15664249. The reversal of 15664241 is 14246651.

15664241 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 6270016 + 9394225 = 2504^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 15664241 - 2² = 15664237 is a prime.

It is a super-2 number, since 2×15664241² = 490736892212162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15664249) 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, 7040 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (3920313).

Almost surely, 2^15664241 is an apocalyptic number.

It is an amenable number.

15664241 is a deficient number, since it is larger than the sum of its proper divisors (17011).

15664241 is an equidigital number, since it uses as much as digits as its factorization.

15664241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17010.

The product of its digits is 5760, while the sum is 29.

The square root of 15664241 is about 3957.8076001746. The cubic root of 15664241 is about 250.2091103760.

The spelling of 15664241 in words is "fifteen million, six hundred sixty-four thousand, two hundred forty-one".