15591201 has 4 divisors (see below), whose sum is σ = 20788272. Its totient is φ = 10394132.

The previous prime is 15591197. The next prime is 15591209. The reversal of 15591201 is 10219551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15591201 - 2² = 15591197 is a prime.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (15591209) 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, 2598531 + ... + 2598536.

It is an arithmetic number, because the mean of its divisors is an integer number (5197068).

Almost surely, 2^15591201 is an apocalyptic number.

It is an amenable number.

15591201 is a deficient number, since it is larger than the sum of its proper divisors (5197071).

15591201 is an equidigital number, since it uses as much as digits as its factorization.

15591201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197070.

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 15591201 is about 3948.5694878019. The cubic root of 15591201 is about 249.8196085336.

The spelling of 15591201 in words is "fifteen million, five hundred ninety-one thousand, two hundred one".