641364649 has 2 divisors, whose sum is σ = 641364650. Its totient is φ = 641364648.

The previous prime is 641364617. The next prime is 641364653. The reversal of 641364649 is 946463146.

641364649 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., 508953600 + 132411049 = 22560^2 + 11507^2 .

It is a cyclic number.

It is not a de Polignac number, because 641364649 - 2⁵ = 641364617 is a prime.

It is a super-2 number, since 2×641364649² = 822697225973786402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641364149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320682324 + 320682325.

It is an arithmetic number, because the mean of its divisors is an integer number (320682325).

Almost surely, 2^641364649 is an apocalyptic number.

It is an amenable number.

641364649 is a deficient number, since it is larger than the sum of its proper divisors (1).

641364649 is an equidigital number, since it uses as much as digits as its factorization.

641364649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 43.

The square root of 641364649 is about 25325.1781632430. The cubic root of 641364649 is about 862.3859510054.

The spelling of 641364649 in words is "six hundred forty-one million, three hundred sixty-four thousand, six hundred forty-nine".