641677207 has 4 divisors (see below), whose sum is σ = 669576240. Its totient is φ = 613778176.

The previous prime is 641677193. The next prime is 641677217. The reversal of 641677207 is 702776146.

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 641677207 - 2¹¹ = 641675159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641677207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641677217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13949482 + ... + 13949527.

It is an arithmetic number, because the mean of its divisors is an integer number (167394060).

Almost surely, 2^641677207 is an apocalyptic number.

641677207 is a deficient number, since it is larger than the sum of its proper divisors (27899033).

641677207 is a wasteful number, since it uses less digits than its factorization.

641677207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27899032.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 641677207 is about 25331.3483060022. The cubic root of 641677207 is about 862.5260178947.

The spelling of 641677207 in words is "six hundred forty-one million, six hundred seventy-seven thousand, two hundred seven".