511643313 has 24 divisors (see below), whose sum is σ = 766172160. Its totient is φ = 328668480.

The previous prime is 511643309. The next prime is 511643347. The reversal of 511643313 is 313346115.

511643313 is a `hidden beast` number, since 5 + 1 + 1 + 643 + 3 + 13 = 666.

It is not a de Polignac number, because 511643313 - 2² = 511643309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (511643383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62845 + ... + 70517.

It is an arithmetic number, because the mean of its divisors is an integer number (31923840).

Almost surely, 2^511643313 is an apocalyptic number.

It is an amenable number.

511643313 is a deficient number, since it is larger than the sum of its proper divisors (254528847).

511643313 is a wasteful number, since it uses less digits than its factorization.

511643313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949 (or 7946 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 511643313 is about 22619.5338811391. The cubic root of 511643313 is about 799.8141823639.

Adding to 511643313 its reverse (313346115), we get a palindrome (824989428).

The spelling of 511643313 in words is "five hundred eleven million, six hundred forty-three thousand, three hundred thirteen".