511891 has 2 divisors, whose sum is σ = 511892. Its totient is φ = 511890.

The previous prime is 511873. The next prime is 511897. The reversal of 511891 is 198115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 511891 - 2⁵ = 511859 is a prime.

It is not a weakly prime, because it can be changed into another prime (511897) 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 as a sum of consecutive naturals, namely, 255945 + 255946.

It is an arithmetic number, because the mean of its divisors is an integer number (255946).

2⁵¹¹⁸⁹¹ is an apocalyptic number.

511891 is the 453-rd centered pentagonal number.

511891 is a deficient number, since it is larger than the sum of its proper divisors (1).

511891 is an equidigital number, since it uses as much as digits as its factorization.

511891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 25.

The square root of 511891 is about 715.4655826803. The cubic root of 511891 is about 79.9943225138.

The spelling of 511891 in words is "five hundred eleven thousand, eight hundred ninety-one".