641289941 has 2 divisors, whose sum is σ = 641289942. Its totient is φ = 641289940.

The previous prime is 641289931. The next prime is 641289947. The reversal of 641289941 is 149982146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641153041 + 136900 = 25321^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 641289941 - 2²⁶ = 574181077 is a prime.

It is a super-2 number, since 2×641289941² = 822505576855566962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641289892 and 641289901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641289947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320644970 + 320644971.

It is an arithmetic number, because the mean of its divisors is an integer number (320644971).

Almost surely, 2^641289941 is an apocalyptic number.

It is an amenable number.

641289941 is a deficient number, since it is larger than the sum of its proper divisors (1).

641289941 is an equidigital number, since it uses as much as digits as its factorization.

641289941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 641289941 is about 25323.7031454722. The cubic root of 641289941 is about 862.3524653061.

The spelling of 641289941 in words is "six hundred forty-one million, two hundred eighty-nine thousand, nine hundred forty-one".