645113837 has 2 divisors, whose sum is σ = 645113838. Its totient is φ = 645113836.

The previous prime is 645113809. The next prime is 645113849. The reversal of 645113837 is 738311546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626701156 + 18412681 = 25034^2 + 4291^2 .

It is a cyclic number.

It is not a de Polignac number, because 645113837 - 2¹⁰ = 645112813 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645113837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645113237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322556918 + 322556919.

It is an arithmetic number, because the mean of its divisors is an integer number (322556919).

Almost surely, 2^645113837 is an apocalyptic number.

It is an amenable number.

645113837 is a deficient number, since it is larger than the sum of its proper divisors (1).

645113837 is an equidigital number, since it uses as much as digits as its factorization.

645113837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 645113837 is about 25399.0912632716. The cubic root of 645113837 is about 864.0630870465.

The spelling of 645113837 in words is "six hundred forty-five million, one hundred thirteen thousand, eight hundred thirty-seven".