512869891 has 2 divisors, whose sum is σ = 512869892. Its totient is φ = 512869890.

The previous prime is 512869879. The next prime is 512869897. The reversal of 512869891 is 198968215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 512869891 - 2¹¹ = 512867843 is a prime.

It is not a weakly prime, because it can be changed into another prime (512869897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256434945 + 256434946.

It is an arithmetic number, because the mean of its divisors is an integer number (256434946).

Almost surely, 2^512869891 is an apocalyptic number.

512869891 is a deficient number, since it is larger than the sum of its proper divisors (1).

512869891 is an equidigital number, since it uses as much as digits as its factorization.

512869891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 49.

The square root of 512869891 is about 22646.6308973322. The cubic root of 512869891 is about 800.4528118826.

The spelling of 512869891 in words is "five hundred twelve million, eight hundred sixty-nine thousand, eight hundred ninety-one".