645415349 has 2 divisors, whose sum is σ = 645415350. Its totient is φ = 645415348.

The previous prime is 645415339. The next prime is 645415361. The reversal of 645415349 is 943514546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476025124 + 169390225 = 21818^2 + 13015^2 .

It is a cyclic number.

It is not a de Polignac number, because 645415349 - 2⁸ = 645415093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645415339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322707674 + 322707675.

It is an arithmetic number, because the mean of its divisors is an integer number (322707675).

Almost surely, 2^645415349 is an apocalyptic number.

It is an amenable number.

645415349 is a deficient number, since it is larger than the sum of its proper divisors (1).

645415349 is an equidigital number, since it uses as much as digits as its factorization.

645415349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 41.

The square root of 645415349 is about 25405.0260578493. The cubic root of 645415349 is about 864.1976807658.

The spelling of 645415349 in words is "six hundred forty-five million, four hundred fifteen thousand, three hundred forty-nine".