281450639 has 2 divisors, whose sum is σ = 281450640. Its totient is φ = 281450638.

The previous prime is 281450627. The next prime is 281450647. The reversal of 281450639 is 936054182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 281450639 - 2⁸ = 281450383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281453639) 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, 140725319 + 140725320.

It is an arithmetic number, because the mean of its divisors is an integer number (140725320).

Almost surely, 2^281450639 is an apocalyptic number.

281450639 is a deficient number, since it is larger than the sum of its proper divisors (1).

281450639 is an equidigital number, since it uses as much as digits as its factorization.

281450639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 281450639 is about 16776.4906640215. The cubic root of 281450639 is about 655.3411109061.

The spelling of 281450639 in words is "two hundred eighty-one million, four hundred fifty thousand, six hundred thirty-nine".