281488073 has 4 divisors (see below), whose sum is σ = 285344148. Its totient is φ = 277632000.

The previous prime is 281488069. The next prime is 281488079. The reversal of 281488073 is 370884182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102677689 + 178810384 = 10133^2 + 13372^2 .

It is a cyclic number.

It is not a de Polignac number, because 281488073 - 2² = 281488069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 281488073.

It is not an unprimeable number, because it can be changed into a prime (281488079) 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 in 3 ways as a sum of consecutive naturals, for example, 1927928 + ... + 1928073.

It is an arithmetic number, because the mean of its divisors is an integer number (71336037).

Almost surely, 2^281488073 is an apocalyptic number.

It is an amenable number.

281488073 is a deficient number, since it is larger than the sum of its proper divisors (3856075).

281488073 is an equidigital number, since it uses as much as digits as its factorization.

281488073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856074.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 281488073 is about 16777.6062952973. The cubic root of 281488073 is about 655.3701639006.

The spelling of 281488073 in words is "two hundred eighty-one million, four hundred eighty-eight thousand, seventy-three".