645123301 has 2 divisors, whose sum is σ = 645123302. Its totient is φ = 645123300.

The previous prime is 645123289. The next prime is 645123313. The reversal of 645123301 is 103321546.

It is a balanced prime because it is at equal distance from previous prime (645123289) and next prime (645123313).

It can be written as a sum of positive squares in only one way, i.e., 338523201 + 306600100 = 18399^2 + 17510^2 .

It is a cyclic number.

It is not a de Polignac number, because 645123301 - 2⁷ = 645123173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645123341) 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, 322561650 + 322561651.

It is an arithmetic number, because the mean of its divisors is an integer number (322561651).

Almost surely, 2^645123301 is an apocalyptic number.

It is an amenable number.

645123301 is a deficient number, since it is larger than the sum of its proper divisors (1).

645123301 is an equidigital number, since it uses as much as digits as its factorization.

645123301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 645123301 is about 25399.2775684664. The cubic root of 645123301 is about 864.0673123747.

Adding to 645123301 its reverse (103321546), we get a palindrome (748444847).

The spelling of 645123301 in words is "six hundred forty-five million, one hundred twenty-three thousand, three hundred one".