405005091 has 16 divisors (see below), whose sum is σ = 569825280. Its totient is φ = 255358400.

The previous prime is 405005033. The next prime is 405005101. The reversal of 405005091 is 190500504.

It is a cyclic number.

It is not a de Polignac number, because 405005091 - 2¹⁹ = 404480803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405005591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26835 + ... + 39116.

It is an arithmetic number, because the mean of its divisors is an integer number (35614080).

Almost surely, 2^405005091 is an apocalyptic number.

405005091 is a deficient number, since it is larger than the sum of its proper divisors (164820189).

405005091 is a wasteful number, since it uses less digits than its factorization.

405005091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66066.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 405005091 is about 20124.7382840125. The cubic root of 405005091 is about 739.8667224061.

Adding to 405005091 its reverse (190500504), we get a palindrome (595505595).

The spelling of 405005091 in words is "four hundred five million, five thousand, ninety-one".