281145 has 8 divisors (see below), whose sum is σ = 449856. Its totient is φ = 149936.

The previous prime is 281131. The next prime is 281153. The reversal of 281145 is 541182.

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

It is a cyclic number.

It is not a de Polignac number, because 281145 - 2⁶ = 281081 is a prime.

It is a super-2 number, since 2×281145² = 158085022050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9357 + ... + 9386.

It is an arithmetic number, because the mean of its divisors is an integer number (56232).

2²⁸¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

281145 is a deficient number, since it is larger than the sum of its proper divisors (168711).

281145 is a wasteful number, since it uses less digits than its factorization.

281145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18751.

The product of its digits is 320, while the sum is 21.

The square root of 281145 is about 530.2310816993. The cubic root of 281145 is about 65.5103804227.

The spelling of 281145 in words is "two hundred eighty-one thousand, one hundred forty-five".