291421 has 8 divisors (see below), whose sum is σ = 325080. Its totient is φ = 259392.

The previous prime is 291419. The next prime is 291437. The reversal of 291421 is 124192.

It can be written as a sum of positive squares in 4 ways, for example, as 900 + 290521 = 30^2 + 539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 291421 - 2¹ = 291419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (40635).

2²⁹¹⁴²¹ is an apocalyptic number.

It is an amenable number.

291421 is a deficient number, since it is larger than the sum of its proper divisors (33659).

291421 is a wasteful number, since it uses less digits than its factorization.

291421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815.

The product of its digits is 144, while the sum is 19.

The square root of 291421 is about 539.8342338163. The cubic root of 291421 is about 66.2989954402.

It can be divided in two parts, 29 and 1421, that multiplied together give a square (41209 = 203²).

The spelling of 291421 in words is "two hundred ninety-one thousand, four hundred twenty-one".