281057 has 4 divisors (see below), whose sum is σ = 321216. Its totient is φ = 240900.

The previous prime is 281053. The next prime is 281063. The reversal of 281057 is 750182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 750182 = 2 ⋅375091.

It is a cyclic number.

It is not a de Polignac number, because 281057 - 2² = 281053 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281057.

It is not an unprimeable number, because it can be changed into a prime (281053) 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, 20069 + ... + 20082.

It is an arithmetic number, because the mean of its divisors is an integer number (80304).

2²⁸¹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

281057 is a deficient number, since it is larger than the sum of its proper divisors (40159).

281057 is an equidigital number, since it uses as much as digits as its factorization.

281057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40158.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 281057 is about 530.1480925176. The cubic root of 281057 is about 65.5035446676.

The spelling of 281057 in words is "two hundred eighty-one thousand, fifty-seven".