405091 has 2 divisors, whose sum is σ = 405092. Its totient is φ = 405090.

The previous prime is 405089. The next prime is 405143. The reversal of 405091 is 190504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405091 - 2¹ = 405089 is a prime.

Together with 405089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (405001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202545 + 202546.

It is an arithmetic number, because the mean of its divisors is an integer number (202546).

2⁴⁰⁵⁰⁹¹ is an apocalyptic number.

405091 is a deficient number, since it is larger than the sum of its proper divisors (1).

405091 is an equidigital number, since it uses as much as digits as its factorization.

405091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 405091 is about 636.4675954045. The cubic root of 405091 is about 73.9919031803.

Adding to 405091 its reverse (190504), we get a palindrome (595595).

The spelling of 405091 in words is "four hundred five thousand, ninety-one".