645135127 has 12 divisors (see below), whose sum is σ = 808192056. Its totient is φ = 510436080.

The previous prime is 645135109. The next prime is 645135143. The reversal of 645135127 is 721531546.

It is a de Polignac number, because none of the positive numbers 2^k-645135127 is a prime.

It is a super-2 number, since 2×645135127² = 832398664178612258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645135092 and 645135101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645135107) 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 in 11 ways as a sum of consecutive naturals, for example, 505749 + ... + 507022.

It is an arithmetic number, because the mean of its divisors is an integer number (67349338).

Almost surely, 2^645135127 is an apocalyptic number.

645135127 is a deficient number, since it is larger than the sum of its proper divisors (163056929).

645135127 is a wasteful number, since it uses less digits than its factorization.

645135127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012798 (or 1012791 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 645135127 is about 25399.5103692965. The cubic root of 645135127 is about 864.0725921910.

The spelling of 645135127 in words is "six hundred forty-five million, one hundred thirty-five thousand, one hundred twenty-seven".