6436641091 has 2 divisors, whose sum is σ = 6436641092. Its totient is φ = 6436641090.

The previous prime is 6436641059. The next prime is 6436641173. The reversal of 6436641091 is 1901466346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6436641091 - 2⁵ = 6436641059 is a prime.

It is not a weakly prime, because it can be changed into another prime (6436641041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3218320545 + 3218320546.

It is an arithmetic number, because the mean of its divisors is an integer number (3218320546).

Almost surely, 2^6436641091 is an apocalyptic number.

6436641091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6436641091 is an equidigital number, since it uses as much as digits as its factorization.

6436641091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 6436641091 is about 80228.6799779231. The cubic root of 6436641091 is about 1860.1719780667.

The spelling of 6436641091 in words is "six billion, four hundred thirty-six million, six hundred forty-one thousand, ninety-one".