641106005 has 4 divisors (see below), whose sum is σ = 769327212. Its totient is φ = 512884800.

The previous prime is 641106001. The next prime is 641106007. The reversal of 641106005 is 500601146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500601146 = 2 ⋅250300573.

It can be written as a sum of positive squares in 2 ways, for example, as 160224964 + 480881041 = 12658^2 + 21929^2 .

It is not a de Polignac number, because 641106005 - 2² = 641106001 is a prime.

It is a super-2 number, since 2×641106005² = 822033819294120050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641106001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64110596 + ... + 64110605.

It is an arithmetic number, because the mean of its divisors is an integer number (192331803).

Almost surely, 2^641106005 is an apocalyptic number.

It is an amenable number.

641106005 is a deficient number, since it is larger than the sum of its proper divisors (128221207).

641106005 is a wasteful number, since it uses less digits than its factorization.

641106005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128221206.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 641106005 is about 25320.0711886835. The cubic root of 641106005 is about 862.2700102312.

The spelling of 641106005 in words is "six hundred forty-one million, one hundred six thousand, five".