281551 has 2 divisors, whose sum is σ = 281552. Its totient is φ = 281550.

The previous prime is 281549. The next prime is 281557. The reversal of 281551 is 155182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281551 - 2¹ = 281549 is a prime.

Together with 281549, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281557) 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, 140775 + 140776.

It is an arithmetic number, because the mean of its divisors is an integer number (140776).

2²⁸¹⁵⁵¹ is an apocalyptic number.

281551 is a deficient number, since it is larger than the sum of its proper divisors (1).

281551 is an equidigital number, since it uses as much as digits as its factorization.

281551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 400, while the sum is 22.

The square root of 281551 is about 530.6137955236. The cubic root of 281551 is about 65.5418996527.

The spelling of 281551 in words is "two hundred eighty-one thousand, five hundred fifty-one".