641391063 has 16 divisors (see below), whose sum is σ = 872121600. Its totient is φ = 419210496.

The previous prime is 641391061. The next prime is 641391083. The reversal of 641391063 is 360193146.

It is not a de Polignac number, because 641391063 - 2¹ = 641391061 is a prime.

It is a super-2 number, since 2×641391063² = 822764991392539938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641391061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20838 + ... + 41436.

It is an arithmetic number, because the mean of its divisors is an integer number (54507600).

Almost surely, 2^641391063 is an apocalyptic number.

641391063 is a deficient number, since it is larger than the sum of its proper divisors (230730537).

641391063 is a wasteful number, since it uses less digits than its factorization.

641391063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20806.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 641391063 is about 25325.6996546986. The cubic root of 641391063 is about 862.3977896944.

The spelling of 641391063 in words is "six hundred forty-one million, three hundred ninety-one thousand, sixty-three".