280766921 has 2 divisors, whose sum is σ = 280766922. Its totient is φ = 280766920.

The previous prime is 280766903. The next prime is 280766963. The reversal of 280766921 is 129667082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190136521 + 90630400 = 13789^2 + 9520^2 .

It is a cyclic number.

It is not a de Polignac number, because 280766921 - 2²² = 276572617 is a prime.

It is not a weakly prime, because it can be changed into another prime (280766821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140383460 + 140383461.

It is an arithmetic number, because the mean of its divisors is an integer number (140383461).

Almost surely, 2^280766921 is an apocalyptic number.

It is an amenable number.

280766921 is a deficient number, since it is larger than the sum of its proper divisors (1).

280766921 is an equidigital number, since it uses as much as digits as its factorization.

280766921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 280766921 is about 16756.1010082895. The cubic root of 280766921 is about 654.8100150198.

The spelling of 280766921 in words is "two hundred eighty million, seven hundred sixty-six thousand, nine hundred twenty-one".