646125113 has 2 divisors, whose sum is σ = 646125114. Its totient is φ = 646125112.

The previous prime is 646125101. The next prime is 646125163. The reversal of 646125113 is 311521646.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545082409 + 101042704 = 23347^2 + 10052^2 .

It is a cyclic number.

It is not a de Polignac number, because 646125113 - 2¹⁶ = 646059577 is a prime.

It is not a weakly prime, because it can be changed into another prime (646125163) 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, 323062556 + 323062557.

It is an arithmetic number, because the mean of its divisors is an integer number (323062557).

Almost surely, 2^646125113 is an apocalyptic number.

It is an amenable number.

646125113 is a deficient number, since it is larger than the sum of its proper divisors (1).

646125113 is an equidigital number, since it uses as much as digits as its factorization.

646125113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 646125113 is about 25418.9911876927. The cubic root of 646125113 is about 864.5143511070.

Adding to 646125113 its reverse (311521646), we get a palindrome (957646759).

The spelling of 646125113 in words is "six hundred forty-six million, one hundred twenty-five thousand, one hundred thirteen".