281261 has 4 divisors (see below), whose sum is σ = 283452. Its totient is φ = 279072.

The previous prime is 281251. The next prime is 281273. The reversal of 281261 is 162182.

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 155236 + 126025 = 394^2 + 355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281261 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281261.

It is not an unprimeable number, because it can be changed into a prime (281251) 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, 890 + ... + 1163.

It is an arithmetic number, because the mean of its divisors is an integer number (70863).

2²⁸¹²⁶¹ is an apocalyptic number.

It is an amenable number.

281261 is a deficient number, since it is larger than the sum of its proper divisors (2191).

281261 is a wasteful number, since it uses less digits than its factorization.

281261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190.

The product of its digits is 192, while the sum is 20.

The square root of 281261 is about 530.3404566880. The cubic root of 281261 is about 65.5193890117.

The spelling of 281261 in words is "two hundred eighty-one thousand, two hundred sixty-one".