291281 has 4 divisors (see below), whose sum is σ = 293232. Its totient is φ = 289332.

The previous prime is 291271. The next prime is 291287. The reversal of 291281 is 182192.

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.

It is a cyclic number.

It is not a de Polignac number, because 291281 - 2⁶ = 291217 is a prime.

It is a super-2 number, since 2×291281² = 169689241922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291281.

It is not an unprimeable number, because it can be changed into a prime (291287) 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, 731 + ... + 1056.

It is an arithmetic number, because the mean of its divisors is an integer number (73308).

2²⁹¹²⁸¹ is an apocalyptic number.

It is an amenable number.

291281 is a deficient number, since it is larger than the sum of its proper divisors (1951).

291281 is a wasteful number, since it uses less digits than its factorization.

291281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950.

The product of its digits is 288, while the sum is 23.

The square root of 291281 is about 539.7045488043. The cubic root of 291281 is about 66.2883769580.

The spelling of 291281 in words is "two hundred ninety-one thousand, two hundred eighty-one".