641001111 has 8 divisors (see below), whose sum is σ = 855267840. Its totient is φ = 427034232.

The previous prime is 641001091. The next prime is 641001113. The reversal of 641001111 is 111100146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641001111 - 2⁵ = 641001079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641001113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69925 + ... + 78558.

It is an arithmetic number, because the mean of its divisors is an integer number (106908480).

Almost surely, 2^641001111 is an apocalyptic number.

641001111 is a deficient number, since it is larger than the sum of its proper divisors (214266729).

641001111 is a wasteful number, since it uses less digits than its factorization.

641001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149925.

The product of its (nonzero) digits is 24, while the sum is 15.

The square root of 641001111 is about 25317.9997432657. Note that the first 3 decimals coincide. The cubic root of 641001111 is about 862.2229811476. Note that the first 3 decimals are identical.

Adding to 641001111 its reverse (111100146), we get a palindrome (752101257).

The spelling of 641001111 in words is "six hundred forty-one million, one thousand, one hundred eleven".