641340433 has 2 divisors, whose sum is σ = 641340434. Its totient is φ = 641340432.

The previous prime is 641340367. The next prime is 641340449. The reversal of 641340433 is 334043146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349203969 + 292136464 = 18687^2 + 17092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641340433 is a prime.

It is a super-2 number, since 2×641340433² = 822635102001254978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641340463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320670216 + 320670217.

It is an arithmetic number, because the mean of its divisors is an integer number (320670217).

Almost surely, 2^641340433 is an apocalyptic number.

It is an amenable number.

641340433 is a deficient number, since it is larger than the sum of its proper divisors (1).

641340433 is an equidigital number, since it uses as much as digits as its factorization.

641340433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 641340433 is about 25324.7000574538. The cubic root of 641340433 is about 862.3750971690.

Adding to 641340433 its reverse (334043146), we get a palindrome (975383579).

The spelling of 641340433 in words is "six hundred forty-one million, three hundred forty thousand, four hundred thirty-three".