281139447 has 8 divisors (see below), whose sum is σ = 394581760. Its totient is φ = 177561720.

The previous prime is 281139413. The next prime is 281139457. The reversal of 281139447 is 744931182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 281139447 - 2¹⁰ = 281138423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281139457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2466079 + ... + 2466192.

It is an arithmetic number, because the mean of its divisors is an integer number (49322720).

Almost surely, 2^281139447 is an apocalyptic number.

281139447 is a deficient number, since it is larger than the sum of its proper divisors (113442313).

281139447 is a wasteful number, since it uses less digits than its factorization.

281139447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4932293.

The product of its digits is 48384, while the sum is 39.

The square root of 281139447 is about 16767.2134536422. The cubic root of 281139447 is about 655.0994911318.

The spelling of 281139447 in words is "two hundred eighty-one million, one hundred thirty-nine thousand, four hundred forty-seven".