511861 has 8 divisors (see below), whose sum is σ = 592704. Its totient is φ = 432960.

The previous prime is 511859. The next prime is 511867. The reversal of 511861 is 168115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 511861 - 2¹ = 511859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (74088).

2⁵¹¹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

511861 is a deficient number, since it is larger than the sum of its proper divisors (80843).

511861 is an equidigital number, since it uses as much as digits as its factorization.

511861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its digits is 240, while the sum is 22.

The square root of 511861 is about 715.4446170040. Note that the first 3 decimals coincide. The cubic root of 511861 is about 79.9927597614.

Adding to 511861 its reverse (168115), we get a palindrome (679976).

The spelling of 511861 in words is "five hundred eleven thousand, eight hundred sixty-one".