409521320091 has 24 divisors (see below), whose sum is σ = 670561229520. Its totient is φ = 238749270336.

The previous prime is 409521320017. The next prime is 409521320093. The reversal of 409521320091 is 190023125904.

409521320091 is a `hidden beast` number, since 40 + 9 + 521 + 3 + 2 + 0 + 0 + 91 = 666.

It is not a de Polignac number, because 409521320091 - 2³⁰ = 408447578267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (409521320093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92107836 + ... + 92112281.

It is an arithmetic number, because the mean of its divisors is an integer number (27940051230).

Almost surely, 2^409521320091 is an apocalyptic number.

409521320091 is a deficient number, since it is larger than the sum of its proper divisors (261039909429).

409521320091 is a wasteful number, since it uses less digits than its factorization.

409521320091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184220155 (or 184220152 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

Adding to 409521320091 its reverse (190023125904), we get a palindrome (599544445995).

The spelling of 409521320091 in words is "four hundred nine billion, five hundred twenty-one million, three hundred twenty thousand, ninety-one".