27805541 has 2 divisors, whose sum is σ = 27805542. Its totient is φ = 27805540.

The previous prime is 27805501. The next prime is 27805559. The reversal of 27805541 is 14550872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 3500641 = 4930^2 + 1871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27805541 is a prime.

It is a super-2 number, since 2×27805541² = 1546296220605362, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27805498 and 27805507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27805501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13902770 + 13902771.

It is an arithmetic number, because the mean of its divisors is an integer number (13902771).

Almost surely, 2^27805541 is an apocalyptic number.

It is an amenable number.

27805541 is a deficient number, since it is larger than the sum of its proper divisors (1).

27805541 is an equidigital number, since it uses as much as digits as its factorization.

27805541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 27805541 is about 5273.0959596806. The cubic root of 27805541 is about 302.9542967879.

The spelling of 27805541 in words is "twenty-seven million, eight hundred five thousand, five hundred forty-one".