645103133 has 2 divisors, whose sum is σ = 645103134. Its totient is φ = 645103132.

The previous prime is 645103051. The next prime is 645103159. The reversal of 645103133 is 331301546.

It is an a-pointer prime, because the next prime (645103159) can be obtained adding 645103133 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 476025124 + 169078009 = 21818^2 + 13003^2 .

It is a cyclic number.

It is not a de Polignac number, because 645103133 - 2¹⁰ = 645102109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645103933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322551566 + 322551567.

It is an arithmetic number, because the mean of its divisors is an integer number (322551567).

Almost surely, 2^645103133 is an apocalyptic number.

It is an amenable number.

645103133 is a deficient number, since it is larger than the sum of its proper divisors (1).

645103133 is an equidigital number, since it uses as much as digits as its factorization.

645103133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 645103133 is about 25398.8805461973. The cubic root of 645103133 is about 864.0583080541.

Adding to 645103133 its reverse (331301546), we get a palindrome (976404679).

The spelling of 645103133 in words is "six hundred forty-five million, one hundred three thousand, one hundred thirty-three".