641111197 has 4 divisors (see below), whose sum is σ = 643494780. Its totient is φ = 638727616.

The previous prime is 641111189. The next prime is 641111201. The reversal of 641111197 is 791111146.

641111197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 80084601 + 561026596 = 8949^2 + 23686^2 .

It is a cyclic number.

It is not a de Polignac number, because 641111197 - 2³ = 641111189 is a prime.

It is a super-2 number, since 2×641111197² = 822047133837545618, 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 (641111117) 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, 1191388 + ... + 1191925.

It is an arithmetic number, because the mean of its divisors is an integer number (160873695).

Almost surely, 2^641111197 is an apocalyptic number.

It is an amenable number.

641111197 is a deficient number, since it is larger than the sum of its proper divisors (2383583).

641111197 is a wasteful number, since it uses less digits than its factorization.

641111197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383582.

The product of its digits is 1512, while the sum is 31.

The square root of 641111197 is about 25320.1737158338. The cubic root of 641111197 is about 862.2723379241.

The spelling of 641111197 in words is "six hundred forty-one million, one hundred eleven thousand, one hundred ninety-seven".