512311381 has 2 divisors, whose sum is σ = 512311382. Its totient is φ = 512311380.

The previous prime is 512311369. The next prime is 512311427. The reversal of 512311381 is 183113215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512116900 + 194481 = 22630^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 512311381 - 2¹¹ = 512309333 is a prime.

It is a super-2 number, since 2×512311381² = 524925902204254322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512311981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256155690 + 256155691.

It is an arithmetic number, because the mean of its divisors is an integer number (256155691).

Almost surely, 2^512311381 is an apocalyptic number.

It is an amenable number.

512311381 is a deficient number, since it is larger than the sum of its proper divisors (1).

512311381 is an equidigital number, since it uses as much as digits as its factorization.

512311381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 25.

The square root of 512311381 is about 22634.2965651685. The cubic root of 512311381 is about 800.1621447383.

Adding to 512311381 its reverse (183113215), we get a palindrome (695424596).

The spelling of 512311381 in words is "five hundred twelve million, three hundred eleven thousand, three hundred eighty-one".