645028159 has 2 divisors, whose sum is σ = 645028160. Its totient is φ = 645028158.

The previous prime is 645028157. The next prime is 645028171. The reversal of 645028159 is 951820546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645028159 - 2¹ = 645028157 is a prime.

It is a super-2 number, since 2×645028159² = 832122651805858562, which contains 22 as substring.

Together with 645028157, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645028151) 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, 322514079 + 322514080.

It is an arithmetic number, because the mean of its divisors is an integer number (322514080).

Almost surely, 2^645028159 is an apocalyptic number.

645028159 is a deficient number, since it is larger than the sum of its proper divisors (1).

645028159 is an equidigital number, since it uses as much as digits as its factorization.

645028159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 645028159 is about 25397.4045721211. The cubic root of 645028159 is about 864.0248330875.

The spelling of 645028159 in words is "six hundred forty-five million, twenty-eight thousand, one hundred fifty-nine".