27720101 has 2 divisors, whose sum is σ = 27720102. Its totient is φ = 27720100.

The previous prime is 27720097. The next prime is 27720137. The reversal of 27720101 is 10102772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27552001 + 168100 = 5249^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 27720101 - 2² = 27720097 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27720151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860050 + 13860051.

It is an arithmetic number, because the mean of its divisors is an integer number (13860051).

Almost surely, 2^27720101 is an apocalyptic number.

It is an amenable number.

27720101 is a deficient number, since it is larger than the sum of its proper divisors (1).

27720101 is an equidigital number, since it uses as much as digits as its factorization.

27720101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 27720101 is about 5264.9882241084. The cubic root of 27720101 is about 302.6436755734.

Adding to 27720101 its reverse (10102772), we get a palindrome (37822873).

The spelling of 27720101 in words is "twenty-seven million, seven hundred twenty thousand, one hundred one".