281481623 has 2 divisors, whose sum is σ = 281481624. Its totient is φ = 281481622.

The previous prime is 281481611. The next prime is 281481653. The reversal of 281481623 is 326184182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281481623 - 2⁸ = 281481367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281481653) 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, 140740811 + 140740812.

It is an arithmetic number, because the mean of its divisors is an integer number (140740812).

Almost surely, 2^281481623 is an apocalyptic number.

281481623 is a deficient number, since it is larger than the sum of its proper divisors (1).

281481623 is an equidigital number, since it uses as much as digits as its factorization.

281481623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 35.

The square root of 281481623 is about 16777.4140736885. The cubic root of 281481623 is about 655.3651581588.

The spelling of 281481623 in words is "two hundred eighty-one million, four hundred eighty-one thousand, six hundred twenty-three".