27550121 has 4 divisors (see below), whose sum is σ = 27570000. Its totient is φ = 27530244.

The previous prime is 27550111. The next prime is 27550129. The reversal of 27550121 is 12105572.

It is a happy number.

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 27550121 - 2¹⁸ = 27287977 is a prime.

It is a super-2 number, since 2×27550121² = 1518018334229282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27550129) 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, 7691 + ... + 10688.

It is an arithmetic number, because the mean of its divisors is an integer number (6892500).

Almost surely, 2^27550121 is an apocalyptic number.

It is an amenable number.

27550121 is a deficient number, since it is larger than the sum of its proper divisors (19879).

27550121 is a wasteful number, since it uses less digits than its factorization.

27550121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19878.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 27550121 is about 5248.8209152151. The cubic root of 27550121 is about 302.0238019046.

Adding to 27550121 its reverse (12105572), we get a palindrome (39655693).

The spelling of 27550121 in words is "twenty-seven million, five hundred fifty thousand, one hundred twenty-one".