641699 has 4 divisors (see below), whose sum is σ = 679464. Its totient is φ = 603936.

The previous prime is 641681. The next prime is 641701. The reversal of 641699 is 996146.

641699 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, and also an emirpimes, since its reverse is a distinct semiprime: 996146 = 2 ⋅498073.

It is a cyclic number.

It is not a de Polignac number, because 641699 - 2¹² = 637603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641639) 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, 18857 + ... + 18890.

It is an arithmetic number, because the mean of its divisors is an integer number (169866).

2⁶⁴¹⁶⁹⁹ is an apocalyptic number.

641699 is a deficient number, since it is larger than the sum of its proper divisors (37765).

641699 is a wasteful number, since it uses less digits than its factorization.

641699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37764.

The product of its digits is 11664, while the sum is 35.

The square root of 641699 is about 801.0611711973. The cubic root of 641699 is about 86.2535782314.

The spelling of 641699 in words is "six hundred forty-one thousand, six hundred ninety-nine".