511631 has 2 divisors, whose sum is σ = 511632. Its totient is φ = 511630.

The previous prime is 511627. The next prime is 511633. The reversal of 511631 is 136115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 511631 - 2² = 511627 is a prime.

It is a super-2 number, since 2×511631² = 523532560322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 511633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511633) 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, 255815 + 255816.

It is an arithmetic number, because the mean of its divisors is an integer number (255816).

2⁵¹¹⁶³¹ is an apocalyptic number.

511631 is a deficient number, since it is larger than the sum of its proper divisors (1).

511631 is an equidigital number, since it uses as much as digits as its factorization.

511631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 17.

The square root of 511631 is about 715.2838597368. The cubic root of 511631 is about 79.9807766311.

Adding to 511631 its reverse (136115), we get a palindrome (647746).

The spelling of 511631 in words is "five hundred eleven thousand, six hundred thirty-one".