641021369 has 2 divisors, whose sum is σ = 641021370. Its totient is φ = 641021368.

The previous prime is 641021341. The next prime is 641021389. The reversal of 641021369 is 963120146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515290000 + 125731369 = 22700^2 + 11213^2 .

It is a cyclic number.

It is not a de Polignac number, because 641021369 - 2⁸ = 641021113 is a prime.

It is a super-2 number, since 2×641021369² = 821816791029268322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (641021389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320510684 + 320510685.

It is an arithmetic number, because the mean of its divisors is an integer number (320510685).

Almost surely, 2^641021369 is an apocalyptic number.

It is an amenable number.

641021369 is a deficient number, since it is larger than the sum of its proper divisors (1).

641021369 is an equidigital number, since it uses as much as digits as its factorization.

641021369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 641021369 is about 25318.3998112045. The cubic root of 641021369 is about 862.2320641943.

The spelling of 641021369 in words is "six hundred forty-one million, twenty-one thousand, three hundred sixty-nine".