645314161 has 2 divisors, whose sum is σ = 645314162. Its totient is φ = 645314160.

The previous prime is 645314147. The next prime is 645314179. The reversal of 645314161 is 161413546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629759025 + 15555136 = 25095^2 + 3944^2 .

It is a cyclic number.

It is not a de Polignac number, because 645314161 - 2²⁹ = 108443249 is a prime.

It is not a weakly prime, because it can be changed into another prime (645314141) 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, 322657080 + 322657081.

It is an arithmetic number, because the mean of its divisors is an integer number (322657081).

Almost surely, 2^645314161 is an apocalyptic number.

It is an amenable number.

645314161 is a deficient number, since it is larger than the sum of its proper divisors (1).

645314161 is an equidigital number, since it uses as much as digits as its factorization.

645314161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 645314161 is about 25403.0344840926. The cubic root of 645314161 is about 864.1525155321.

The spelling of 645314161 in words is "six hundred forty-five million, three hundred fourteen thousand, one hundred sixty-one".