27150721 has 4 divisors (see below), whose sum is σ = 29239252. Its totient is φ = 25062192.

The previous prime is 27150707. The next prime is 27150727. The reversal of 27150721 is 12705172.

It is a happy number.

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 9678321 + 17472400 = 3111^2 + 4180^2 .

It is a cyclic number.

It is not a de Polignac number, because 27150721 - 2⁵ = 27150689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27150727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1044246 + ... + 1044271.

It is an arithmetic number, because the mean of its divisors is an integer number (7309813).

Almost surely, 2^27150721 is an apocalyptic number.

It is an amenable number.

27150721 is a deficient number, since it is larger than the sum of its proper divisors (2088531).

27150721 is a wasteful number, since it uses less digits than its factorization.

27150721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088530.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 27150721 is about 5210.6353739251. The cubic root of 27150721 is about 300.5571904147.

Adding to 27150721 its reverse (12705172), we get a palindrome (39855893).

The spelling of 27150721 in words is "twenty-seven million, one hundred fifty thousand, seven hundred twenty-one".