27561601 has 4 divisors (see below), whose sum is σ = 27572400. Its totient is φ = 27550804.

The previous prime is 27561563. The next prime is 27561617. The reversal of 27561601 is 10616572.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 27561601 - 2⁹ = 27561089 is a prime.

It is a pancake number, because a pancake can be divided into 27561601 parts by 7424 straight cuts.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27561601.

It is not an unprimeable number, because it can be changed into a prime (27561671) 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, 810 + ... + 7468.

It is an arithmetic number, because the mean of its divisors is an integer number (6893100).

Almost surely, 2^27561601 is an apocalyptic number.

It is an amenable number.

27561601 is a deficient number, since it is larger than the sum of its proper divisors (10799).

27561601 is an equidigital number, since it uses as much as digits as its factorization.

27561601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10798.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 27561601 is about 5249.9143802542. The cubic root of 27561601 is about 302.0657466903.

The spelling of 27561601 in words is "twenty-seven million, five hundred sixty-one thousand, six hundred one".