641006687 has 2 divisors, whose sum is σ = 641006688. Its totient is φ = 641006686.

The previous prime is 641006683. The next prime is 641006713. The reversal of 641006687 is 786600146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641006687 - 2² = 641006683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641006687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641006683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320503343 + 320503344.

It is an arithmetic number, because the mean of its divisors is an integer number (320503344).

Almost surely, 2^641006687 is an apocalyptic number.

641006687 is a deficient number, since it is larger than the sum of its proper divisors (1).

641006687 is an equidigital number, since it uses as much as digits as its factorization.

641006687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 641006687 is about 25318.1098623100. The cubic root of 641006687 is about 862.2254812688.

The spelling of 641006687 in words is "six hundred forty-one million, six thousand, six hundred eighty-seven".