641109 has 8 divisors (see below), whose sum is σ = 976960. Its totient is φ = 366336.

The previous prime is 641101. The next prime is 641129. The reversal of 641109 is 901146.

641109 = T₁₁₀ + T₁₁₁ + ... + T₁₇₂.

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

It is not a de Polignac number, because 641109 - 2³ = 641101 is a prime.

It is a super-2 number, since 2×641109² = 822041499762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 30529 = 641109 / (6 + 4 + 1 + 1 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641101) 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, 15244 + ... + 15285.

It is an arithmetic number, because the mean of its divisors is an integer number (122120).

2⁶⁴¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

641109 is a deficient number, since it is larger than the sum of its proper divisors (335851).

641109 is a wasteful number, since it uses less digits than its factorization.

641109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30539.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 641109 is about 800.6928249960. The cubic root of 641109 is about 86.2271352960.

The spelling of 641109 in words is "six hundred forty-one thousand, one hundred nine".