646743133 has 2 divisors, whose sum is σ = 646743134. Its totient is φ = 646743132.

The previous prime is 646743101. The next prime is 646743151. The reversal of 646743133 is 331347646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324648324 + 322094809 = 18018^2 + 17947^2 .

It is a cyclic number.

It is not a de Polignac number, because 646743133 - 2⁵ = 646743101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646743092 and 646743101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646843133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323371566 + 323371567.

It is an arithmetic number, because the mean of its divisors is an integer number (323371567).

Almost surely, 2^646743133 is an apocalyptic number.

It is an amenable number.

646743133 is a deficient number, since it is larger than the sum of its proper divisors (1).

646743133 is an equidigital number, since it uses as much as digits as its factorization.

646743133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 37.

The square root of 646743133 is about 25431.1449408004. The cubic root of 646743133 is about 864.7898998566.

The spelling of 646743133 in words is "six hundred forty-six million, seven hundred forty-three thousand, one hundred thirty-three".