280748957 has 2 divisors, whose sum is σ = 280748958. Its totient is φ = 280748956.

The previous prime is 280748939. The next prime is 280748969. The reversal of 280748957 is 759847082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280696516 + 52441 = 16754^2 + 229^2 .

It is a cyclic number.

It is not a de Polignac number, because 280748957 - 2²⁰ = 279700381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280748917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140374478 + 140374479.

It is an arithmetic number, because the mean of its divisors is an integer number (140374479).

Almost surely, 2^280748957 is an apocalyptic number.

It is an amenable number.

280748957 is a deficient number, since it is larger than the sum of its proper divisors (1).

280748957 is an equidigital number, since it uses as much as digits as its factorization.

280748957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The square root of 280748957 is about 16755.5649561571. The cubic root of 280748957 is about 654.7960493931.

The spelling of 280748957 in words is "two hundred eighty million, seven hundred forty-eight thousand, nine hundred fifty-seven".