280252789 has 2 divisors, whose sum is σ = 280252790. Its totient is φ = 280252788.

The previous prime is 280252757. The next prime is 280252813. The reversal of 280252789 is 987252082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151044100 + 129208689 = 12290^2 + 11367^2 .

It is a cyclic number.

It is not a de Polignac number, because 280252789 - 2⁵ = 280252757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280232789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140126394 + 140126395.

It is an arithmetic number, because the mean of its divisors is an integer number (140126395).

Almost surely, 2^280252789 is an apocalyptic number.

It is an amenable number.

280252789 is a deficient number, since it is larger than the sum of its proper divisors (1).

280252789 is an equidigital number, since it uses as much as digits as its factorization.

280252789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 280252789 is about 16740.7523427115. The cubic root of 280252789 is about 654.4100812907.

The spelling of 280252789 in words is "two hundred eighty million, two hundred fifty-two thousand, seven hundred eighty-nine".