281386449857 has 2 divisors, whose sum is σ = 281386449858. Its totient is φ = 281386449856.

The previous prime is 281386449829. The next prime is 281386449893. The reversal of 281386449857 is 758944683182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278906509456 + 2479940401 = 528116^2 + 49799^2 .

It is a cyclic number.

It is not a de Polignac number, because 281386449857 - 2²⁰ = 281385401281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 281386449793 and 281386449802.

It is not a weakly prime, because it can be changed into another prime (281386649857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140693224928 + 140693224929.

It is an arithmetic number, because the mean of its divisors is an integer number (140693224929).

Almost surely, 2^281386449857 is an apocalyptic number.

It is an amenable number.

281386449857 is a deficient number, since it is larger than the sum of its proper divisors (1).

281386449857 is an equidigital number, since it uses as much as digits as its factorization.

281386449857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92897280, while the sum is 65.

The spelling of 281386449857 in words is "two hundred eighty-one billion, three hundred eighty-six million, four hundred forty-nine thousand, eight hundred fifty-seven".