641464969 has 2 divisors, whose sum is σ = 641464970. Its totient is φ = 641464968.

The previous prime is 641464951. The next prime is 641464973. The reversal of 641464969 is 969464146.

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., 376166025 + 265298944 = 19395^2 + 16288^2 .

It is a cyclic number.

It is not a de Polignac number, because 641464969 - 2¹⁵ = 641432201 is a prime.

It is a super-2 number, since 2×641464969² = 822954612908341922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641464939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320732484 + 320732485.

It is an arithmetic number, because the mean of its divisors is an integer number (320732485).

Almost surely, 2^641464969 is an apocalyptic number.

It is an amenable number.

641464969 is a deficient number, since it is larger than the sum of its proper divisors (1).

641464969 is an equidigital number, since it uses as much as digits as its factorization.

641464969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 49.

The square root of 641464969 is about 25327.1587233941. The cubic root of 641464969 is about 862.4309124525.

The spelling of 641464969 in words is "six hundred forty-one million, four hundred sixty-four thousand, nine hundred sixty-nine".