645446113 has 4 divisors (see below), whose sum is σ = 695095828. Its totient is φ = 595796400.

The previous prime is 645446111. The next prime is 645446129. The reversal of 645446113 is 311644546.

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

It can be written as a sum of positive squares in 2 ways, for example, as 176810209 + 468635904 = 13297^2 + 21648^2 .

It is a cyclic number.

It is not a de Polignac number, because 645446113 - 2¹ = 645446111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645446111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24824838 + ... + 24824863.

It is an arithmetic number, because the mean of its divisors is an integer number (173773957).

Almost surely, 2^645446113 is an apocalyptic number.

It is an amenable number.

645446113 is a deficient number, since it is larger than the sum of its proper divisors (49649715).

645446113 is a wasteful number, since it uses less digits than its factorization.

645446113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49649714.

The product of its digits is 34560, while the sum is 34.

The square root of 645446113 is about 25405.6315213773. The cubic root of 645446113 is about 864.2114113323.

The spelling of 645446113 in words is "six hundred forty-five million, four hundred forty-six thousand, one hundred thirteen".