512642821 has 2 divisors, whose sum is σ = 512642822. Its totient is φ = 512642820.

The previous prime is 512642797. The next prime is 512642827. The reversal of 512642821 is 128246215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387538596 + 125104225 = 19686^2 + 11185^2 .

It is a cyclic number.

It is not a de Polignac number, because 512642821 - 2²³ = 504254213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512642827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256321410 + 256321411.

It is an arithmetic number, because the mean of its divisors is an integer number (256321411).

Almost surely, 2^512642821 is an apocalyptic number.

It is an amenable number.

512642821 is a deficient number, since it is larger than the sum of its proper divisors (1).

512642821 is an equidigital number, since it uses as much as digits as its factorization.

512642821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 512642821 is about 22641.6170138089. The cubic root of 512642821 is about 800.3346625858.

The spelling of 512642821 in words is "five hundred twelve million, six hundred forty-two thousand, eight hundred twenty-one".