641266993 has 2 divisors, whose sum is σ = 641266994. Its totient is φ = 641266992.

The previous prime is 641266987. The next prime is 641267093. The reversal of 641266993 is 399662146.

641266993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560410929 + 80856064 = 23673^2 + 8992^2 .

It is a cyclic number.

It is not a de Polignac number, because 641266993 - 2¹⁷ = 641135921 is a prime.

It is a super-2 number, since 2×641266993² = 822446712622524098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641264993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320633496 + 320633497.

It is an arithmetic number, because the mean of its divisors is an integer number (320633497).

Almost surely, 2^641266993 is an apocalyptic number.

It is an amenable number.

641266993 is a deficient number, since it is larger than the sum of its proper divisors (1).

641266993 is an equidigital number, since it uses as much as digits as its factorization.

641266993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 46.

The square root of 641266993 is about 25323.2500481277. The cubic root of 641266993 is about 862.3421790070.

The spelling of 641266993 in words is "six hundred forty-one million, two hundred sixty-six thousand, nine hundred ninety-three".