641099 has 4 divisors (see below), whose sum is σ = 658464. Its totient is φ = 623736.

The previous prime is 641093. The next prime is 641101. The reversal of 641099 is 990146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641099 - 2⁴ = 641083 is a prime.

It is a super-2 number, since 2×641099² = 822015855602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641093) 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, 8627 + ... + 8700.

It is an arithmetic number, because the mean of its divisors is an integer number (164616).

2⁶⁴¹⁰⁹⁹ is an apocalyptic number.

641099 is a deficient number, since it is larger than the sum of its proper divisors (17365).

641099 is a wasteful number, since it uses less digits than its factorization.

641099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17364.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 641099 is about 800.6865803796. The cubic root of 641099 is about 86.2266869709.

The spelling of 641099 in words is "six hundred forty-one thousand, ninety-nine".