512641649 has 4 divisors (see below), whose sum is σ = 552075636. Its totient is φ = 473207664.

The previous prime is 512641631. The next prime is 512641663. The reversal of 512641649 is 946146215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114918400 + 397723249 = 10720^2 + 19943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-512641649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (512641249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19716974 + ... + 19716999.

It is an arithmetic number, because the mean of its divisors is an integer number (138018909).

Almost surely, 2^512641649 is an apocalyptic number.

It is an amenable number.

512641649 is a deficient number, since it is larger than the sum of its proper divisors (39433987).

512641649 is a wasteful number, since it uses less digits than its factorization.

512641649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39433986.

The product of its digits is 51840, while the sum is 38.

The square root of 512641649 is about 22641.5911322504. The cubic root of 512641649 is about 800.3340526791.

The spelling of 512641649 in words is "five hundred twelve million, six hundred forty-one thousand, six hundred forty-nine".