291393 has 6 divisors (see below), whose sum is σ = 420914. Its totient is φ = 194256.

The previous prime is 291377. The next prime is 291419. The reversal of 291393 is 393192.

It can be written as a sum of positive squares in only one way, i.e., 263169 + 28224 = 513^2 + 168^2 .

It is not a de Polignac number, because 291393 - 2⁴ = 291377 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291393.

It is not an unprimeable number, because it can be changed into a prime (291373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16180 + ... + 16197.

2²⁹¹³⁹³ is an apocalyptic number.

It is an amenable number.

291393 is a deficient number, since it is larger than the sum of its proper divisors (129521).

291393 is a wasteful number, since it uses less digits than its factorization.

291393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32383 (or 32380 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 291393 is about 539.8082993063. The cubic root of 291393 is about 66.2968720158.

The spelling of 291393 in words is "two hundred ninety-one thousand, three hundred ninety-three".