641697 has 8 divisors (see below), whose sum is σ = 977856. Its totient is φ = 366672.

The previous prime is 641681. The next prime is 641701. The reversal of 641697 is 796146.

It is a happy number.

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

It is not a de Polignac number, because 641697 - 2⁴ = 641681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641197) 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, 15258 + ... + 15299.

It is an arithmetic number, because the mean of its divisors is an integer number (122232).

2⁶⁴¹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

641697 is a deficient number, since it is larger than the sum of its proper divisors (336159).

641697 is a wasteful number, since it uses less digits than its factorization.

641697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30567.

The product of its digits is 9072, while the sum is 33.

The square root of 641697 is about 801.0599228522. The cubic root of 641697 is about 86.2534886218.

Subtracting 641697 from its reverse (796146), we obtain a square (154449 = 393²).

The spelling of 641697 in words is "six hundred forty-one thousand, six hundred ninety-seven".