280490891 has 4 divisors (see below), whose sum is σ = 280551000. Its totient is φ = 280430784.

The previous prime is 280490869. The next prime is 280490909. The reversal of 280490891 is 198094082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280490891 - 2⁶ = 280490827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280490831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22406 + ... + 32603.

It is an arithmetic number, because the mean of its divisors is an integer number (70137750).

Almost surely, 2^280490891 is an apocalyptic number.

280490891 is a deficient number, since it is larger than the sum of its proper divisors (60109).

280490891 is an equidigital number, since it uses as much as digits as its factorization.

280490891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60108.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 280490891 is about 16747.8622814973. The cubic root of 280490891 is about 654.5953571667.

The spelling of 280490891 in words is "two hundred eighty million, four hundred ninety thousand, eight hundred ninety-one".