291271 has 2 divisors, whose sum is σ = 291272. Its totient is φ = 291270.

The previous prime is 291257. The next prime is 291287. The reversal of 291271 is 172192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291271 - 2⁷ = 291143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145635 + 145636.

It is an arithmetic number, because the mean of its divisors is an integer number (145636).

2²⁹¹²⁷¹ is an apocalyptic number.

291271 is a deficient number, since it is larger than the sum of its proper divisors (1).

291271 is an equidigital number, since it uses as much as digits as its factorization.

291271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 22.

The square root of 291271 is about 539.6952843967. The cubic root of 291271 is about 66.2876183648.

The spelling of 291271 in words is "two hundred ninety-one thousand, two hundred seventy-one".