280787009 has 2 divisors, whose sum is σ = 280787010. Its totient is φ = 280787008.

The previous prime is 280786993. The next prime is 280787021. The reversal of 280787009 is 900787082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160402225 + 120384784 = 12665^2 + 10972^2 .

It is a cyclic number.

It is not a de Polignac number, because 280787009 - 2⁴ = 280786993 is a prime.

It is equal to p_15266588 and since 280787009 and 15266588 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (280787609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140393504 + 140393505.

It is an arithmetic number, because the mean of its divisors is an integer number (140393505).

Almost surely, 2^280787009 is an apocalyptic number.

It is an amenable number.

280787009 is a deficient number, since it is larger than the sum of its proper divisors (1).

280787009 is an equidigital number, since it uses as much as digits as its factorization.

280787009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 280787009 is about 16756.7004210256. The cubic root of 280787009 is about 654.8256311874.

The spelling of 280787009 in words is "two hundred eighty million, seven hundred eighty-seven thousand, nine".