280888969 has 2 divisors, whose sum is σ = 280888970. Its totient is φ = 280888968.

The previous prime is 280888963. The next prime is 280888981. The reversal of 280888969 is 969888082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166719744 + 114169225 = 12912^2 + 10685^2 .

It is a cyclic number.

It is not a de Polignac number, because 280888969 - 2³ = 280888961 is a prime.

It is a super-2 number, since 2×280888969² = 157797225811765922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (280888961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140444484 + 140444485.

It is an arithmetic number, because the mean of its divisors is an integer number (140444485).

Almost surely, 2^280888969 is an apocalyptic number.

It is an amenable number.

280888969 is a deficient number, since it is larger than the sum of its proper divisors (1).

280888969 is an equidigital number, since it uses as much as digits as its factorization.

280888969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 58.

The square root of 280888969 is about 16759.7425099552. The cubic root of 280888969 is about 654.9048821729.

It can be divided in two parts, 280 and 888969, that added together give a square (889249 = 943²).

The spelling of 280888969 in words is "two hundred eighty million, eight hundred eighty-eight thousand, nine hundred sixty-nine".