280941289 has 4 divisors (see below), whose sum is σ = 281013460. Its totient is φ = 280869120.

The previous prime is 280941253. The next prime is 280941293. The reversal of 280941289 is 982149082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 228523689 + 52417600 = 15117^2 + 7240^2 .

It is a cyclic number.

It is not a de Polignac number, because 280941289 - 2¹⁹ = 280417001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280941229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29892 + ... + 38149.

It is an arithmetic number, because the mean of its divisors is an integer number (70253365).

Almost surely, 2^280941289 is an apocalyptic number.

It is an amenable number.

280941289 is a deficient number, since it is larger than the sum of its proper divisors (72171).

280941289 is an equidigital number, since it uses as much as digits as its factorization.

280941289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72170.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 280941289 is about 16761.3033204462. The cubic root of 280941289 is about 654.9455417692.

The spelling of 280941289 in words is "two hundred eighty million, nine hundred forty-one thousand, two hundred eighty-nine".