512344991 has 2 divisors, whose sum is σ = 512344992. Its totient is φ = 512344990.

The previous prime is 512344981. The next prime is 512344999. The reversal of 512344991 is 199443215.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-512344991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512344999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256172495 + 256172496.

It is an arithmetic number, because the mean of its divisors is an integer number (256172496).

Almost surely, 2^512344991 is an apocalyptic number.

512344991 is a deficient number, since it is larger than the sum of its proper divisors (1).

512344991 is an equidigital number, since it uses as much as digits as its factorization.

512344991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 512344991 is about 22635.0390103485. The cubic root of 512344991 is about 800.1796424702.

The spelling of 512344991 in words is "five hundred twelve million, three hundred forty-four thousand, nine hundred ninety-one".