27720151 has 2 divisors, whose sum is σ = 27720152. Its totient is φ = 27720150.

The previous prime is 27720139. The next prime is 27720167. The reversal of 27720151 is 15102772.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27720151 - 2¹⁵ = 27687383 is a prime.

It is equal to p_1725082 and since 27720151 and 1725082 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27720101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860075 + 13860076.

It is an arithmetic number, because the mean of its divisors is an integer number (13860076).

Almost surely, 2^27720151 is an apocalyptic number.

27720151 is a deficient number, since it is larger than the sum of its proper divisors (1).

27720151 is an equidigital number, since it uses as much as digits as its factorization.

27720151 is an odious number, because the sum of its binary digits is odd.

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

The square root of 27720151 is about 5264.9929724549. The cubic root of 27720151 is about 302.6438575373.

The spelling of 27720151 in words is "twenty-seven million, seven hundred twenty thousand, one hundred fifty-one".