406145091 has 12 divisors (see below), whose sum is σ = 595232456. Its totient is φ = 246148320.

The previous prime is 406145081. The next prime is 406145099. The reversal of 406145091 is 190541604.

It is a happy number.

It is not a de Polignac number, because 406145091 - 2⁵ = 406145059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406145099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 559066 + ... + 559791.

Almost surely, 2^406145091 is an apocalyptic number.

406145091 is a deficient number, since it is larger than the sum of its proper divisors (189087365).

406145091 is a wasteful number, since it uses less digits than its factorization.

406145091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118882 (or 1118871 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 406145091 is about 20153.0417307165. The cubic root of 406145091 is about 740.5602593056.

Adding to 406145091 its reverse (190541604), we get a palindrome (596686695).

The spelling of 406145091 in words is "four hundred six million, one hundred forty-five thousand, ninety-one".