280274749 has 2 divisors, whose sum is σ = 280274750. Its totient is φ = 280274748.

The previous prime is 280274747. The next prime is 280274789. The reversal of 280274749 is 947472082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279491524 + 783225 = 16718^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 280274749 - 2¹ = 280274747 is a prime.

Together with 280274747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280274747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140137374 + 140137375.

It is an arithmetic number, because the mean of its divisors is an integer number (140137375).

Almost surely, 2^280274749 is an apocalyptic number.

It is an amenable number.

280274749 is a deficient number, since it is larger than the sum of its proper divisors (1).

280274749 is an equidigital number, since it uses as much as digits as its factorization.

280274749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 280274749 is about 16741.4082143648. The cubic root of 280274749 is about 654.4271735620.

The spelling of 280274749 in words is "two hundred eighty million, two hundred seventy-four thousand, seven hundred forty-nine".