27121687 has 2 divisors, whose sum is σ = 27121688. Its totient is φ = 27121686.

The previous prime is 27121663. The next prime is 27121693. The reversal of 27121687 is 78612172.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27121687 - 2¹⁹ = 26597399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27121657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13560843 + 13560844.

It is an arithmetic number, because the mean of its divisors is an integer number (13560844).

Almost surely, 2^27121687 is an apocalyptic number.

27121687 is a deficient number, since it is larger than the sum of its proper divisors (1).

27121687 is an equidigital number, since it uses as much as digits as its factorization.

27121687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 34.

The square root of 27121687 is about 5207.8485961095. The cubic root of 27121687 is about 300.4500172034.

The spelling of 27121687 in words is "twenty-seven million, one hundred twenty-one thousand, six hundred eighty-seven".