511913 has 4 divisors (see below), whose sum is σ = 513360. Its totient is φ = 510468.

The previous prime is 511909. The next prime is 511933. The reversal of 511913 is 319115.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 319115 = 5 ⋅63823.

It is a cyclic number.

It is not a de Polignac number, because 511913 - 2² = 511909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511933) 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 in 3 ways as a sum of consecutive naturals, for example, 206 + ... + 1032.

It is an arithmetic number, because the mean of its divisors is an integer number (128340).

2⁵¹¹⁹¹³ is an apocalyptic number.

It is an amenable number.

511913 is a deficient number, since it is larger than the sum of its proper divisors (1447).

511913 is an equidigital number, since it uses as much as digits as its factorization.

511913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446.

The product of its digits is 135, while the sum is 20.

The square root of 511913 is about 715.4809571191. The cubic root of 511913 is about 79.9954684933.

The spelling of 511913 in words is "five hundred eleven thousand, nine hundred thirteen".