280505651 has 2 divisors, whose sum is σ = 280505652. Its totient is φ = 280505650.

The previous prime is 280505629. The next prime is 280505653. The reversal of 280505651 is 156505082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280505651 - 2⁶ = 280505587 is a prime.

Together with 280505653, 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 (280505653) 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, 140252825 + 140252826.

It is an arithmetic number, because the mean of its divisors is an integer number (140252826).

Almost surely, 2^280505651 is an apocalyptic number.

280505651 is a deficient number, since it is larger than the sum of its proper divisors (1).

280505651 is an equidigital number, since it uses as much as digits as its factorization.

280505651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 280505651 is about 16748.3029289537. The cubic root of 280505651 is about 654.6068390108.

The spelling of 280505651 in words is "two hundred eighty million, five hundred five thousand, six hundred fifty-one".