280090891 has 2 divisors, whose sum is σ = 280090892. Its totient is φ = 280090890.

The previous prime is 280090871. The next prime is 280090901. The reversal of 280090891 is 198090082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280090891 - 2²³ = 271702283 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280090891.

It is not a weakly prime, because it can be changed into another prime (280090801) 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, 140045445 + 140045446.

It is an arithmetic number, because the mean of its divisors is an integer number (140045446).

Almost surely, 2^280090891 is an apocalyptic number.

280090891 is a deficient number, since it is larger than the sum of its proper divisors (1).

280090891 is an equidigital number, since it uses as much as digits as its factorization.

280090891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 280090891 is about 16735.9161984040. The cubic root of 280090891 is about 654.2840425910.

The spelling of 280090891 in words is "two hundred eighty million, ninety thousand, eight hundred ninety-one".