641194769 has 2 divisors, whose sum is σ = 641194770. Its totient is φ = 641194768.

The previous prime is 641194753. The next prime is 641194781. The reversal of 641194769 is 967491146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499299025 + 141895744 = 22345^2 + 11912^2 .

It is a cyclic number.

It is not a de Polignac number, because 641194769 - 2⁴ = 641194753 is a prime.

It is a super-2 number, since 2×641194769² = 822261463585926722, 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 (641194709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320597384 + 320597385.

It is an arithmetic number, because the mean of its divisors is an integer number (320597385).

Almost surely, 2^641194769 is an apocalyptic number.

It is an amenable number.

641194769 is a deficient number, since it is larger than the sum of its proper divisors (1).

641194769 is an equidigital number, since it uses as much as digits as its factorization.

641194769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 641194769 is about 25321.8239666893. The cubic root of 641194769 is about 862.3098034440.

The spelling of 641194769 in words is "six hundred forty-one million, one hundred ninety-four thousand, seven hundred sixty-nine".