280819920397 has 2 divisors, whose sum is σ = 280819920398. Its totient is φ = 280819920396.

The previous prime is 280819920377. The next prime is 280819920419. The reversal of 280819920397 is 793029918082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252532380676 + 28287539721 = 502526^2 + 168189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280819920397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280819920377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140409960198 + 140409960199.

It is an arithmetic number, because the mean of its divisors is an integer number (140409960199).

Almost surely, 2^280819920397 is an apocalyptic number.

It is an amenable number.

280819920397 is a deficient number, since it is larger than the sum of its proper divisors (1).

280819920397 is an equidigital number, since it uses as much as digits as its factorization.

280819920397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 58.

It can be divided in two parts, 280819 and 920397, that added together give a square (1201216 = 1096²).

The spelling of 280819920397 in words is "two hundred eighty billion, eight hundred nineteen million, nine hundred twenty thousand, three hundred ninety-seven".