280853891 has 2 divisors, whose sum is σ = 280853892. Its totient is φ = 280853890.

The previous prime is 280853873. The next prime is 280853917. The reversal of 280853891 is 198358082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280853891 - 2⁶ = 280853827 is a prime.

It is not a weakly prime, because it can be changed into another prime (280853591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140426945 + 140426946.

It is an arithmetic number, because the mean of its divisors is an integer number (140426946).

Almost surely, 2^280853891 is an apocalyptic number.

280853891 is a deficient number, since it is larger than the sum of its proper divisors (1).

280853891 is an equidigital number, since it uses as much as digits as its factorization.

280853891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 280853891 is about 16758.6959814897. The cubic root of 280853891 is about 654.8776190757.

The spelling of 280853891 in words is "two hundred eighty million, eight hundred fifty-three thousand, eight hundred ninety-one".