280885318949 has 2 divisors, whose sum is σ = 280885318950. Its totient is φ = 280885318948.

The previous prime is 280885318919. The next prime is 280885318969. The reversal of 280885318949 is 949813588082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265217790049 + 15667528900 = 514993^2 + 125170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280885318949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280885318919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140442659474 + 140442659475.

It is an arithmetic number, because the mean of its divisors is an integer number (140442659475).

Almost surely, 2^280885318949 is an apocalyptic number.

It is an amenable number.

280885318949 is a deficient number, since it is larger than the sum of its proper divisors (1).

280885318949 is an equidigital number, since it uses as much as digits as its factorization.

280885318949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39813120, while the sum is 65.

The spelling of 280885318949 in words is "two hundred eighty billion, eight hundred eighty-five million, three hundred eighteen thousand, nine hundred forty-nine".