168631 has 2 divisors, whose sum is σ = 168632. Its totient is φ = 168630.

The previous prime is 168629. The next prime is 168643. The reversal of 168631 is 136861.

It is a weak prime.

It is an emirp because it is prime and its reverse (136861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168631 - 2¹ = 168629 is a prime.

It is a super-2 number, since 2×168631² = 56872828322, which contains 22 as substring.

Together with 168629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 168596 and 168605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84315 + 84316.

It is an arithmetic number, because the mean of its divisors is an integer number (84316).

2¹⁶⁸⁶³¹ is an apocalyptic number.

168631 is the 220-th centered heptagonal number.

168631 is a deficient number, since it is larger than the sum of its proper divisors (1).

168631 is an equidigital number, since it uses as much as digits as its factorization.

168631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 168631 is about 410.6470503973. The cubic root of 168631 is about 55.2474798029.

The spelling of 168631 in words is "one hundred sixty-eight thousand, six hundred thirty-one".