277660961 has 2 divisors, whose sum is σ = 277660962. Its totient is φ = 277660960.

The previous prime is 277660891. The next prime is 277660963. The reversal of 277660961 is 169066772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201640000 + 76020961 = 14200^2 + 8719^2 .

It is a cyclic number.

It is not a de Polignac number, because 277660961 - 2¹⁰ = 277659937 is a prime.

Together with 277660963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (277660963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138830480 + 138830481.

It is an arithmetic number, because the mean of its divisors is an integer number (138830481).

Almost surely, 2^277660961 is an apocalyptic number.

It is an amenable number.

277660961 is a deficient number, since it is larger than the sum of its proper divisors (1).

277660961 is an equidigital number, since it uses as much as digits as its factorization.

277660961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 277660961 is about 16663.1617948095. The cubic root of 277660961 is about 652.3864629257.

The spelling of 277660961 in words is "two hundred seventy-seven million, six hundred sixty thousand, nine hundred sixty-one".