641105691 has 8 divisors (see below), whose sum is σ = 855029760. Its totient is φ = 427292712.

The previous prime is 641105659. The next prime is 641105711. The reversal of 641105691 is 196501146.

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

It is not a de Polignac number, because 641105691 - 2⁵ = 641105659 is a prime.

It is a super-2 number, since 2×641105691² = 822033014065174962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641105651) 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, 13215 + ... + 38168.

It is an arithmetic number, because the mean of its divisors is an integer number (106878720).

Almost surely, 2^641105691 is an apocalyptic number.

641105691 is a deficient number, since it is larger than the sum of its proper divisors (213924069).

641105691 is a wasteful number, since it uses less digits than its factorization.

641105691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55545.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 641105691 is about 25320.0649880683. The cubic root of 641105691 is about 862.2698694573.

The spelling of 641105691 in words is "six hundred forty-one million, one hundred five thousand, six hundred ninety-one".