645738103 has 2 divisors, whose sum is σ = 645738104. Its totient is φ = 645738102.

The previous prime is 645738089. The next prime is 645738139. The reversal of 645738103 is 301837546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645738103 - 2¹³ = 645729911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645738143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322869051 + 322869052.

It is an arithmetic number, because the mean of its divisors is an integer number (322869052).

Almost surely, 2^645738103 is an apocalyptic number.

645738103 is a deficient number, since it is larger than the sum of its proper divisors (1).

645738103 is an equidigital number, since it uses as much as digits as its factorization.

645738103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 645738103 is about 25411.3774321661. The cubic root of 645738103 is about 864.3417103832.

The spelling of 645738103 in words is "six hundred forty-five million, seven hundred thirty-eight thousand, one hundred three".