2277439981 has 2 divisors, whose sum is σ = 2277439982. Its totient is φ = 2277439980.

The previous prime is 2277439979. The next prime is 2277439991. The reversal of 2277439981 is 1899347722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2016908100 + 260531881 = 44910^2 + 16141^2 .

It is a cyclic number.

It is not a de Polignac number, because 2277439981 - 2¹ = 2277439979 is a prime.

It is a super-3 number, since 3×2277439981³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 2277439979, 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 (2277439961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1138719990 + 1138719991.

It is an arithmetic number, because the mean of its divisors is an integer number (1138719991).

Almost surely, 2^2277439981 is an apocalyptic number.

It is an amenable number.

2277439981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2277439981 is an equidigital number, since it uses as much as digits as its factorization.

2277439981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 2277439981 is about 47722.5311671542. The cubic root of 2277439981 is about 1315.6760836934.

The spelling of 2277439981 in words is "two billion, two hundred seventy-seven million, four hundred thirty-nine thousand, nine hundred eighty-one".