281248381 has 2 divisors, whose sum is σ = 281248382. Its totient is φ = 281248380.

The previous prime is 281248343. The next prime is 281248403. The reversal of 281248381 is 183842182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279725625 + 1522756 = 16725^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 281248381 - 2¹³ = 281240189 is a prime.

It is a super-2 number, since 2×281248381² = 158201303630242322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 281248381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281248081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140624190 + 140624191.

It is an arithmetic number, because the mean of its divisors is an integer number (140624191).

Almost surely, 2^281248381 is an apocalyptic number.

It is an amenable number.

281248381 is a deficient number, since it is larger than the sum of its proper divisors (1).

281248381 is an equidigital number, since it uses as much as digits as its factorization.

281248381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 37.

The square root of 281248381 is about 16770.4615619249. The cubic root of 281248381 is about 655.1840913705.

The spelling of 281248381 in words is "two hundred eighty-one million, two hundred forty-eight thousand, three hundred eighty-one".