281420173 has 2 divisors, whose sum is σ = 281420174. Its totient is φ = 281420172.

The previous prime is 281420171. The next prime is 281420207. The reversal of 281420173 is 371024182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253510084 + 27910089 = 15922^2 + 5283^2 .

It is a cyclic number.

It is not a de Polignac number, because 281420173 - 2¹ = 281420171 is a prime.

Together with 281420171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281420171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140710086 + 140710087.

It is an arithmetic number, because the mean of its divisors is an integer number (140710087).

Almost surely, 2^281420173 is an apocalyptic number.

It is an amenable number.

281420173 is a deficient number, since it is larger than the sum of its proper divisors (1).

281420173 is an equidigital number, since it uses as much as digits as its factorization.

281420173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 281420173 is about 16775.5826426387. The cubic root of 281420173 is about 655.3174639618.

The spelling of 281420173 in words is "two hundred eighty-one million, four hundred twenty thousand, one hundred seventy-three".