281137 has 4 divisors (see below), whose sum is σ = 288036. Its totient is φ = 274240.

The previous prime is 281131. The next prime is 281153. The reversal of 281137 is 731182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731182 = 2 ⋅365591.

It can be written as a sum of positive squares in 2 ways, for example, as 6561 + 274576 = 81^2 + 524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3388 + ... + 3469.

It is an arithmetic number, because the mean of its divisors is an integer number (72009).

2²⁸¹¹³⁷ is an apocalyptic number.

It is an amenable number.

281137 is a deficient number, since it is larger than the sum of its proper divisors (6899).

281137 is an equidigital number, since it uses as much as digits as its factorization.

281137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6898.

The product of its digits is 336, while the sum is 22.

The square root of 281137 is about 530.2235377650. The cubic root of 281137 is about 65.5097590494.

The spelling of 281137 in words is "two hundred eighty-one thousand, one hundred thirty-seven".