201040091605 has 4 divisors (see below), whose sum is σ = 241248109932. Its totient is φ = 160832073280.

The previous prime is 201040091591. The next prime is 201040091617. The reversal of 201040091605 is 506190040102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66552132529 + 134487959076 = 257977^2 + 366726^2 .

It is not a de Polignac number, because 201040091605 - 2⁷ = 201040091477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20104009156 + ... + 20104009165.

It is an arithmetic number, because the mean of its divisors is an integer number (60312027483).

Almost surely, 2^201040091605 is an apocalyptic number.

It is an amenable number.

201040091605 is a deficient number, since it is larger than the sum of its proper divisors (40208018327).

201040091605 is an equidigital number, since it uses as much as digits as its factorization.

201040091605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40208018326.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 201040091605 in words is "two hundred one billion, forty million, ninety-one thousand, six hundred five".