641242541 has 2 divisors, whose sum is σ = 641242542. Its totient is φ = 641242540.

The previous prime is 641242487. The next prime is 641242543. The reversal of 641242541 is 145242146.

641242541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434889316 + 206353225 = 20854^2 + 14365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641242541 is a prime.

It is a super-2 number, since 2×641242541² = 822383992776273362, which contains 22 as substring.

Together with 641242543, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641242543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320621270 + 320621271.

It is an arithmetic number, because the mean of its divisors is an integer number (320621271).

Almost surely, 2^641242541 is an apocalyptic number.

It is an amenable number.

641242541 is a deficient number, since it is larger than the sum of its proper divisors (1).

641242541 is an equidigital number, since it uses as much as digits as its factorization.

641242541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 29.

The square root of 641242541 is about 25322.7672460969. The cubic root of 641242541 is about 862.3312182792.

Adding to 641242541 its reverse (145242146), we get a palindrome (786484687).

The spelling of 641242541 in words is "six hundred forty-one million, two hundred forty-two thousand, five hundred forty-one".