27772991 has 2 divisors, whose sum is σ = 27772992. Its totient is φ = 27772990.

The previous prime is 27772963. The next prime is 27773077. The reversal of 27772991 is 19927772.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27772991 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 (27772961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13886495 + 13886496.

It is an arithmetic number, because the mean of its divisors is an integer number (13886496).

Almost surely, 2^27772991 is an apocalyptic number.

27772991 is a deficient number, since it is larger than the sum of its proper divisors (1).

27772991 is an equidigital number, since it uses as much as digits as its factorization.

27772991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 44.

The square root of 27772991 is about 5270.0086337690. The cubic root of 27772991 is about 302.8360348344.

The spelling of 27772991 in words is "twenty-seven million, seven hundred seventy-two thousand, nine hundred ninety-one".