281889005 has 4 divisors (see below), whose sum is σ = 338266812. Its totient is φ = 225511200.

The previous prime is 281889001. The next prime is 281889011. The reversal of 281889005 is 500988182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500988182 = 2 ⋅250494091.

It can be written as a sum of positive squares in 2 ways, for example, as 138344644 + 143544361 = 11762^2 + 11981^2 .

It is not a de Polignac number, because 281889005 - 2² = 281889001 is a prime.

It is a super-2 number, since 2×281889005² = 158922822279780050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281889001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28188896 + ... + 28188905.

It is an arithmetic number, because the mean of its divisors is an integer number (84566703).

Almost surely, 2^281889005 is an apocalyptic number.

It is an amenable number.

281889005 is a deficient number, since it is larger than the sum of its proper divisors (56377807).

281889005 is an equidigital number, since it uses as much as digits as its factorization.

281889005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56377806.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 281889005 is about 16789.5504704563. The cubic root of 281889005 is about 655.6811708225.

The spelling of 281889005 in words is "two hundred eighty-one million, eight hundred eighty-nine thousand, five".