27945961 has 2 divisors, whose sum is σ = 27945962. Its totient is φ = 27945960.

The previous prime is 27945959. The next prime is 27945997. The reversal of 27945961 is 16954972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25190361 + 2755600 = 5019^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 27945961 - 2¹ = 27945959 is a prime.

Together with 27945959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27945061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13972980 + 13972981.

It is an arithmetic number, because the mean of its divisors is an integer number (13972981).

Almost surely, 2^27945961 is an apocalyptic number.

It is an amenable number.

27945961 is a deficient number, since it is larger than the sum of its proper divisors (1).

27945961 is an equidigital number, since it uses as much as digits as its factorization.

27945961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 27945961 is about 5286.3939505111. The cubic root of 27945961 is about 303.4634211041.

The spelling of 27945961 in words is "twenty-seven million, nine hundred forty-five thousand, nine hundred sixty-one".