641241553 has 2 divisors, whose sum is σ = 641241554. Its totient is φ = 641241552.

The previous prime is 641241527. The next prime is 641241569. The reversal of 641241553 is 355142146.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599858064 + 41383489 = 24492^2 + 6433^2 .

It is a cyclic number.

It is not a de Polignac number, because 641241553 - 2⁵ = 641241521 is a prime.

It is a super-2 number, since 2×641241553² = 822381458587703618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641241253) 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 as a sum of consecutive naturals, namely, 320620776 + 320620777.

It is an arithmetic number, because the mean of its divisors is an integer number (320620777).

Almost surely, 2^641241553 is an apocalyptic number.

It is an amenable number.

641241553 is a deficient number, since it is larger than the sum of its proper divisors (1).

641241553 is an equidigital number, since it uses as much as digits as its factorization.

641241553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 641241553 is about 25322.7477379529. The cubic root of 641241553 is about 862.3307753975.

Adding to 641241553 its reverse (355142146), we get a palindrome (996383699).

The spelling of 641241553 in words is "six hundred forty-one million, two hundred forty-one thousand, five hundred fifty-three".