645754313 has 4 divisors (see below), whose sum is σ = 645819408. Its totient is φ = 645689220.

The previous prime is 645754289. The next prime is 645754321. The reversal of 645754313 is 313457546.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 645754313 - 2²² = 641560009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645754013) 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, 14231 + ... + 38652.

It is an arithmetic number, because the mean of its divisors is an integer number (161454852).

Almost surely, 2^645754313 is an apocalyptic number.

It is an amenable number.

645754313 is a deficient number, since it is larger than the sum of its proper divisors (65095).

645754313 is a wasteful number, since it uses less digits than its factorization.

645754313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65094.

The product of its digits is 151200, while the sum is 38.

The square root of 645754313 is about 25411.6963817845. The cubic root of 645754313 is about 864.3489428622.

The spelling of 645754313 in words is "six hundred forty-five million, seven hundred fifty-four thousand, three hundred thirteen".