206017631 has 4 divisors (see below), whose sum is σ = 206801232. Its totient is φ = 205234032.

The previous prime is 206017597. The next prime is 206017633. The reversal of 206017631 is 136710602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206017631 - 2¹⁴ = 206001247 is a prime.

It is a super-2 number, since 2×206017631² = 84886528565704322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206017631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206017633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391406 + ... + 391931.

It is an arithmetic number, because the mean of its divisors is an integer number (51700308).

Almost surely, 2^206017631 is an apocalyptic number.

206017631 is a deficient number, since it is larger than the sum of its proper divisors (783601).

206017631 is an equidigital number, since it uses as much as digits as its factorization.

206017631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783600.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 206017631 is about 14353.3142862546. The cubic root of 206017631 is about 590.6109070142.

It can be divided in two parts, 2060 and 17631, that added together give a palindrome (19691).

The spelling of 206017631 in words is "two hundred six million, seventeen thousand, six hundred thirty-one".