27721151 has 2 divisors, whose sum is σ = 27721152. Its totient is φ = 27721150.

The previous prime is 27721147. The next prime is 27721159. The reversal of 27721151 is 15112772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27721151 - 2² = 27721147 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27721151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27721159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860575 + 13860576.

It is an arithmetic number, because the mean of its divisors is an integer number (13860576).

Almost surely, 2^27721151 is an apocalyptic number.

27721151 is a deficient number, since it is larger than the sum of its proper divisors (1).

27721151 is an equidigital number, since it uses as much as digits as its factorization.

27721151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 980, while the sum is 26.

The square root of 27721151 is about 5265.0879384869. The cubic root of 27721151 is about 302.6474967697.

It can be divided in two parts, 27721 and 151, that added together give a palindrome (27872).

The spelling of 27721151 in words is "twenty-seven million, seven hundred twenty-one thousand, one hundred fifty-one".