291481 has 2 divisors, whose sum is σ = 291482. Its totient is φ = 291480.

The previous prime is 291457. The next prime is 291491. The reversal of 291481 is 184192.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259081 + 32400 = 509^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 291481 - 2¹³ = 283289 is a prime.

It is a super-2 number, since 2×291481² = 169922346722, which contains 22 as substring.

291481 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (291491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145740 + 145741.

It is an arithmetic number, because the mean of its divisors is an integer number (145741).

2²⁹¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

291481 is a deficient number, since it is larger than the sum of its proper divisors (1).

291481 is an equidigital number, since it uses as much as digits as its factorization.

291481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 291481 is about 539.8898035711. The cubic root of 291481 is about 66.3035451772.

The spelling of 291481 in words is "two hundred ninety-one thousand, four hundred eighty-one".