645225313 has 8 divisors (see below), whose sum is σ = 682744320. Its totient is φ = 608062320.

The previous prime is 645225307. The next prime is 645225341. The reversal of 645225313 is 313522546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645225313 - 2¹³ = 645217121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645225013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85270 + ... + 92527.

It is an arithmetic number, because the mean of its divisors is an integer number (85343040).

Almost surely, 2^645225313 is an apocalyptic number.

It is an amenable number.

645225313 is a deficient number, since it is larger than the sum of its proper divisors (37519007).

645225313 is a wasteful number, since it uses less digits than its factorization.

645225313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178007.

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

The square root of 645225313 is about 25401.2856564387. The cubic root of 645225313 is about 864.1128543607.

Adding to 645225313 its reverse (313522546), we get a palindrome (958747859).

The spelling of 645225313 in words is "six hundred forty-five million, two hundred twenty-five thousand, three hundred thirteen".