512521861 has 2 divisors, whose sum is σ = 512521862. Its totient is φ = 512521860.

The previous prime is 512521837. The next prime is 512521871. The reversal of 512521861 is 168125215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 477641025 + 34880836 = 21855^2 + 5906^2 .

It is a cyclic number.

It is not a de Polignac number, because 512521861 - 2⁷ = 512521733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512521871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256260930 + 256260931.

It is an arithmetic number, because the mean of its divisors is an integer number (256260931).

Almost surely, 2^512521861 is an apocalyptic number.

It is an amenable number.

512521861 is a deficient number, since it is larger than the sum of its proper divisors (1).

512521861 is an equidigital number, since it uses as much as digits as its factorization.

512521861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 31.

The square root of 512521861 is about 22638.9456689131. The cubic root of 512521861 is about 800.2717103106.

The spelling of 512521861 in words is "five hundred twelve million, five hundred twenty-one thousand, eight hundred sixty-one".