280690489 has 2 divisors, whose sum is σ = 280690490. Its totient is φ = 280690488.

The previous prime is 280690483. The next prime is 280690493. The reversal of 280690489 is 984096082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197880489 + 82810000 = 14067^2 + 9100^2 .

It is a cyclic number.

It is not a de Polignac number, because 280690489 - 2⁵ = 280690457 is a prime.

It is not a weakly prime, because it can be changed into another prime (280690483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140345244 + 140345245.

It is an arithmetic number, because the mean of its divisors is an integer number (140345245).

Almost surely, 2^280690489 is an apocalyptic number.

It is an amenable number.

280690489 is a deficient number, since it is larger than the sum of its proper divisors (1).

280690489 is an equidigital number, since it uses as much as digits as its factorization.

280690489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 280690489 is about 16753.8201315401. The cubic root of 280690489 is about 654.7505909002.

The spelling of 280690489 in words is "two hundred eighty million, six hundred ninety thousand, four hundred eighty-nine".