2027278861 has 2 divisors, whose sum is σ = 2027278862. Its totient is φ = 2027278860.

The previous prime is 2027278859. The next prime is 2027278867. The reversal of 2027278861 is 1688727202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1808800900 + 218477961 = 42530^2 + 14781^2 .

It is a cyclic number.

It is not a de Polignac number, because 2027278861 - 2¹ = 2027278859 is a prime.

Together with 2027278859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2027278867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1013639430 + 1013639431.

It is an arithmetic number, because the mean of its divisors is an integer number (1013639431).

Almost surely, 2^2027278861 is an apocalyptic number.

It is an amenable number.

2027278861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2027278861 is an equidigital number, since it uses as much as digits as its factorization.

2027278861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 2027278861 is about 45025.3135580420. The cubic root of 2027278861 is about 1265.6234041872.

The spelling of 2027278861 in words is "two billion, twenty-seven million, two hundred seventy-eight thousand, eight hundred sixty-one".