645113197 has 2 divisors, whose sum is σ = 645113198. Its totient is φ = 645113196.

The previous prime is 645113123. The next prime is 645113221. The reversal of 645113197 is 791311546.

It is a happy number.

645113197 is nontrivially palindromic in base 11.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599564196 + 45549001 = 24486^2 + 6749^2 .

It is a cyclic number.

It is not a de Polignac number, because 645113197 - 2²³ = 636724589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645113107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322556598 + 322556599.

It is an arithmetic number, because the mean of its divisors is an integer number (322556599).

Almost surely, 2^645113197 is an apocalyptic number.

It is an amenable number.

645113197 is a deficient number, since it is larger than the sum of its proper divisors (1).

645113197 is an equidigital number, since it uses as much as digits as its factorization.

645113197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 645113197 is about 25399.0786643925. The cubic root of 645113197 is about 864.0628013086.

The spelling of 645113197 in words is "six hundred forty-five million, one hundred thirteen thousand, one hundred ninety-seven".