641221043 has 4 divisors (see below), whose sum is σ = 641479728. Its totient is φ = 640962360.

The previous prime is 641221037. The next prime is 641221057. The reversal of 641221043 is 340122146.

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 641221043 - 2⁸ = 641220787 is a prime.

It is a super-2 number, since 2×641221043² = 822328851972015698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641221843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125588 + ... + 130593.

It is an arithmetic number, because the mean of its divisors is an integer number (160369932).

Almost surely, 2^641221043 is an apocalyptic number.

641221043 is a deficient number, since it is larger than the sum of its proper divisors (258685).

641221043 is a wasteful number, since it uses less digits than its factorization.

641221043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258684.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 641221043 is about 25322.3427628646. The cubic root of 641221043 is about 862.3215814660.

Adding to 641221043 its reverse (340122146), we get a palindrome (981343189).

The spelling of 641221043 in words is "six hundred forty-one million, two hundred twenty-one thousand, forty-three".