641657229 has 4 divisors (see below), whose sum is σ = 855542976. Its totient is φ = 427771484.

The previous prime is 641657201. The next prime is 641657239. The reversal of 641657229 is 922756146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641657229 - 2⁷ = 641657101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641657239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106942869 + ... + 106942874.

It is an arithmetic number, because the mean of its divisors is an integer number (213885744).

Almost surely, 2^641657229 is an apocalyptic number.

It is an amenable number.

641657229 is a deficient number, since it is larger than the sum of its proper divisors (213885747).

641657229 is a wasteful number, since it uses less digits than its factorization.

641657229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213885746.

The product of its digits is 181440, while the sum is 42.

The square root of 641657229 is about 25330.9539694027. The cubic root of 641657229 is about 862.5170664970.

The spelling of 641657229 in words is "six hundred forty-one million, six hundred fifty-seven thousand, two hundred twenty-nine".