645354293 has 2 divisors, whose sum is σ = 645354294. Its totient is φ = 645354292.

The previous prime is 645354271. The next prime is 645354317. The reversal of 645354293 is 392453546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610979524 + 34374769 = 24718^2 + 5863^2 .

It is a cyclic number.

It is not a de Polignac number, because 645354293 - 2¹⁶ = 645288757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645354293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645384293) 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, 322677146 + 322677147.

It is an arithmetic number, because the mean of its divisors is an integer number (322677147).

Almost surely, 2^645354293 is an apocalyptic number.

It is an amenable number.

645354293 is a deficient number, since it is larger than the sum of its proper divisors (1).

645354293 is an equidigital number, since it uses as much as digits as its factorization.

645354293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 41.

The square root of 645354293 is about 25403.8243774436. The cubic root of 645354293 is about 864.1704290033.

The spelling of 645354293 in words is "six hundred forty-five million, three hundred fifty-four thousand, two hundred ninety-three".