280888961 has 2 divisors, whose sum is σ = 280888962. Its totient is φ = 280888960.

The previous prime is 280888939. The next prime is 280888963. The reversal of 280888961 is 169888082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154753600 + 126135361 = 12440^2 + 11231^2 .

It is a cyclic number.

It is not a de Polignac number, because 280888961 - 2²⁶ = 213780097 is a prime.

Together with 280888963, 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 (280888963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140444480 + 140444481.

It is an arithmetic number, because the mean of its divisors is an integer number (140444481).

Almost surely, 2^280888961 is an apocalyptic number.

It is an amenable number.

280888961 is a deficient number, since it is larger than the sum of its proper divisors (1).

280888961 is an equidigital number, since it uses as much as digits as its factorization.

280888961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 50.

The square root of 280888961 is about 16759.7422712881. The cubic root of 280888961 is about 654.9048759555.

The spelling of 280888961 in words is "two hundred eighty million, eight hundred eighty-eight thousand, nine hundred sixty-one".