208631 has 2 divisors, whose sum is σ = 208632. Its totient is φ = 208630.

The previous prime is 208627. The next prime is 208657. The reversal of 208631 is 136802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208631 - 2² = 208627 is a prime.

It is a super-2 number, since 2×208631² = 87053788322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208231) 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, 104315 + 104316.

It is an arithmetic number, because the mean of its divisors is an integer number (104316).

2²⁰⁸⁶³¹ is an apocalyptic number.

208631 is a deficient number, since it is larger than the sum of its proper divisors (1).

208631 is an equidigital number, since it uses as much as digits as its factorization.

208631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 208631 is about 456.7614256918. The cubic root of 208631 is about 59.3097754673.

The spelling of 208631 in words is "two hundred eight thousand, six hundred thirty-one".