511999997 has 4 divisors (see below), whose sum is σ = 519641856. Its totient is φ = 504358140.

The previous prime is 511999979. The next prime is 512000009. The reversal of 511999997 is 799999115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 511999997 - 2⁶ = 511999933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511999907) 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, 3820829 + ... + 3820962.

It is an arithmetic number, because the mean of its divisors is an integer number (129910464).

Almost surely, 2^511999997 is an apocalyptic number.

It is an amenable number.

511999997 is a deficient number, since it is larger than the sum of its proper divisors (7641859).

511999997 is an equidigital number, since it uses as much as digits as its factorization.

511999997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7641858.

The product of its digits is 2066715, while the sum is 59.

The square root of 511999997 is about 22627.4169316783. The cubic root of 511999997 is about 799.9999984375. Note that the first 5 decimals are identical.

The spelling of 511999997 in words is "five hundred eleven million, nine hundred ninety-nine thousand, nine hundred ninety-seven".