645375313 has 4 divisors (see below), whose sum is σ = 704045808. Its totient is φ = 586704820.

The previous prime is 645375307. The next prime is 645375317. The reversal of 645375313 is 313573546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645375313 - 2⁵ = 645375281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645375317) 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, 29335231 + ... + 29335252.

It is an arithmetic number, because the mean of its divisors is an integer number (176011452).

Almost surely, 2^645375313 is an apocalyptic number.

It is an amenable number.

645375313 is a deficient number, since it is larger than the sum of its proper divisors (58670495).

645375313 is a wasteful number, since it uses less digits than its factorization.

645375313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58670494.

The product of its digits is 113400, while the sum is 37.

The square root of 645375313 is about 25404.2380913107. The cubic root of 645375313 is about 864.1798112736.

The spelling of 645375313 in words is "six hundred forty-five million, three hundred seventy-five thousand, three hundred thirteen".