842648281 has 2 divisors, whose sum is σ = 842648282. Its totient is φ = 842648280.

The previous prime is 842648269. The next prime is 842648311. The reversal of 842648281 is 182846248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 840072256 + 2576025 = 28984^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 842648281 - 2²⁵ = 809093849 is a prime.

It is a super-2 number, since 2×842648281² = 1420112250944509922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (842648881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421324140 + 421324141.

It is an arithmetic number, because the mean of its divisors is an integer number (421324141).

Almost surely, 2^842648281 is an apocalyptic number.

It is an amenable number.

842648281 is a deficient number, since it is larger than the sum of its proper divisors (1).

842648281 is an equidigital number, since it uses as much as digits as its factorization.

842648281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196608, while the sum is 43.

The square root of 842648281 is about 29028.4047270945. The cubic root of 842648281 is about 944.5293256271.

The spelling of 842648281 in words is "eight hundred forty-two million, six hundred forty-eight thousand, two hundred eighty-one".