645143035 has 4 divisors (see below), whose sum is σ = 774171648. Its totient is φ = 516114424.

The previous prime is 645143033. The next prime is 645143039. The reversal of 645143035 is 530341546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645143035 - 2¹ = 645143033 is a prime.

It is a super-2 number, since 2×645143035² = 832419071218022450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645142988 and 645143006.

It is not an unprimeable number, because it can be changed into a prime (645143033) 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 in 3 ways as a sum of consecutive naturals, for example, 64514299 + ... + 64514308.

It is an arithmetic number, because the mean of its divisors is an integer number (193542912).

Almost surely, 2^645143035 is an apocalyptic number.

645143035 is a deficient number, since it is larger than the sum of its proper divisors (129028613).

645143035 is a wasteful number, since it uses less digits than its factorization.

645143035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129028612.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 645143035 is about 25399.6660411116. Note that the first 3 decimals coincide. The cubic root of 645143035 is about 864.0761227476.

The spelling of 645143035 in words is "six hundred forty-five million, one hundred forty-three thousand, thirty-five".