280989349 has 2 divisors, whose sum is σ = 280989350. Its totient is φ = 280989348.

The previous prime is 280989299. The next prime is 280989377. The reversal of 280989349 is 943989082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271656324 + 9333025 = 16482^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 280989349 - 2⁷ = 280989221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280989296 and 280989305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280989389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140494674 + 140494675.

It is an arithmetic number, because the mean of its divisors is an integer number (140494675).

Almost surely, 2^280989349 is an apocalyptic number.

It is an amenable number.

280989349 is a deficient number, since it is larger than the sum of its proper divisors (1).

280989349 is an equidigital number, since it uses as much as digits as its factorization.

280989349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 280989349 is about 16762.7369185345. The cubic root of 280989349 is about 654.9828863310.

The spelling of 280989349 in words is "two hundred eighty million, nine hundred eighty-nine thousand, three hundred forty-nine".