512656381 has 2 divisors, whose sum is σ = 512656382. Its totient is φ = 512656380.

The previous prime is 512656357. The next prime is 512656387. The reversal of 512656381 is 183656215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418857156 + 93799225 = 20466^2 + 9685^2 .

It is a cyclic number.

It is not a de Polignac number, because 512656381 - 2²⁵ = 479101949 is a prime.

It is a super-2 number, since 2×512656381² = 525633129960034322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 512656381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512656387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256328190 + 256328191.

It is an arithmetic number, because the mean of its divisors is an integer number (256328191).

Almost surely, 2^512656381 is an apocalyptic number.

It is an amenable number.

512656381 is a deficient number, since it is larger than the sum of its proper divisors (1).

512656381 is an equidigital number, since it uses as much as digits as its factorization.

512656381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The square root of 512656381 is about 22641.9164604059. The cubic root of 512656381 is about 800.3417191184.

The spelling of 512656381 in words is "five hundred twelve million, six hundred fifty-six thousand, three hundred eighty-one".