641335433 has 2 divisors, whose sum is σ = 641335434. Its totient is φ = 641335432.

The previous prime is 641335417. The next prime is 641335447. The reversal of 641335433 is 334533146.

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., 638926729 + 2408704 = 25277^2 + 1552^2 .

It is a cyclic number.

It is not a de Polignac number, because 641335433 - 2⁴ = 641335417 is a prime.

It is a super-2 number, since 2×641335433² = 822622275242594978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641335433.

It is not a weakly prime, because it can be changed into another prime (641334433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320667716 + 320667717.

It is an arithmetic number, because the mean of its divisors is an integer number (320667717).

Almost surely, 2^641335433 is an apocalyptic number.

It is an amenable number.

641335433 is a deficient number, since it is larger than the sum of its proper divisors (1).

641335433 is an equidigital number, since it uses as much as digits as its factorization.

641335433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 32.

The square root of 641335433 is about 25324.6013394091. The cubic root of 641335433 is about 862.3728560884.

Adding to 641335433 its reverse (334533146), we get a palindrome (975868579).

The spelling of 641335433 in words is "six hundred forty-one million, three hundred thirty-five thousand, four hundred thirty-three".