280332989 has 2 divisors, whose sum is σ = 280332990. Its totient is φ = 280332988.

The previous prime is 280332977. The next prime is 280332991. The reversal of 280332989 is 989233082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278556100 + 1776889 = 16690^2 + 1333^2 .

It is a cyclic number.

It is not a de Polignac number, because 280332989 - 2⁸ = 280332733 is a prime.

Together with 280332991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280332959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140166494 + 140166495.

It is an arithmetic number, because the mean of its divisors is an integer number (140166495).

Almost surely, 2^280332989 is an apocalyptic number.

It is an amenable number.

280332989 is a deficient number, since it is larger than the sum of its proper divisors (1).

280332989 is an equidigital number, since it uses as much as digits as its factorization.

280332989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 280332989 is about 16743.1475236886. The cubic root of 280332989 is about 654.4724995609.

The spelling of 280332989 in words is "two hundred eighty million, three hundred thirty-two thousand, nine hundred eighty-nine".