641384569 has 6 divisors (see below), whose sum is σ = 746100474. Its totient is φ = 549758160.

The previous prime is 641384533. The next prime is 641384587. The reversal of 641384569 is 965483146.

It can be written as a sum of positive squares in only one way, i.e., 528770025 + 112614544 = 22995^2 + 10612^2 .

It is not a de Polignac number, because 641384569 - 2⁹ = 641384057 is a prime.

It is a super-2 number, since 2×641384569² = 822748330702631522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641384519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6544692 + ... + 6544789.

It is an arithmetic number, because the mean of its divisors is an integer number (124350079).

Almost surely, 2^641384569 is an apocalyptic number.

It is an amenable number.

641384569 is a deficient number, since it is larger than the sum of its proper divisors (104715905).

641384569 is a wasteful number, since it uses less digits than its factorization.

641384569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13089495 (or 13089488 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The square root of 641384569 is about 25325.5714446881. The cubic root of 641384569 is about 862.3948791299.

The spelling of 641384569 in words is "six hundred forty-one million, three hundred eighty-four thousand, five hundred sixty-nine".