277648961 has 2 divisors, whose sum is σ = 277648962. Its totient is φ = 277648960.

The previous prime is 277648949. The next prime is 277648993. The reversal of 277648961 is 169846772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144961600 + 132687361 = 12040^2 + 11519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-277648961 is a prime.

It is not a weakly prime, because it can be changed into another prime (277648561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138824480 + 138824481.

It is an arithmetic number, because the mean of its divisors is an integer number (138824481).

Almost surely, 2^277648961 is an apocalyptic number.

It is an amenable number.

277648961 is a deficient number, since it is larger than the sum of its proper divisors (1).

277648961 is an equidigital number, since it uses as much as digits as its factorization.

277648961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 50.

The square root of 277648961 is about 16662.8017151978. The cubic root of 277648961 is about 652.3770644728.

The spelling of 277648961 in words is "two hundred seventy-seven million, six hundred forty-eight thousand, nine hundred sixty-one".