280748969 has 2 divisors, whose sum is σ = 280748970. Its totient is φ = 280748968.

The previous prime is 280748957. The next prime is 280748977. The reversal of 280748969 is 969847082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277555600 + 3193369 = 16660^2 + 1787^2 .

It is a cyclic number.

It is not a de Polignac number, because 280748969 - 2²⁸ = 12313513 is a prime.

It is a super-2 number, since 2×280748969² = 157639967189125922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 280748969.

It is not a weakly prime, because it can be changed into another prime (280748939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140374484 + 140374485.

It is an arithmetic number, because the mean of its divisors is an integer number (140374485).

Almost surely, 2^280748969 is an apocalyptic number.

It is an amenable number.

280748969 is a deficient number, since it is larger than the sum of its proper divisors (1).

280748969 is an equidigital number, since it uses as much as digits as its factorization.

280748969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 280748969 is about 16755.5653142471. The cubic root of 280748969 is about 654.7960587224.

The spelling of 280748969 in words is "two hundred eighty million, seven hundred forty-eight thousand, nine hundred sixty-nine".