206431 has 4 divisors (see below), whose sum is σ = 218592. Its totient is φ = 194272.

The previous prime is 206419. The next prime is 206447. The reversal of 206431 is 134602.

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 206431 - 2⁵ = 206399 is a prime.

It is a super-2 number, since 2×206431² = 85227515522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6055 + ... + 6088.

It is an arithmetic number, because the mean of its divisors is an integer number (54648).

2²⁰⁶⁴³¹ is an apocalyptic number.

206431 is a deficient number, since it is larger than the sum of its proper divisors (12161).

206431 is a wasteful number, since it uses less digits than its factorization.

206431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12160.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 206431 is about 454.3467838557. The cubic root of 206431 is about 59.1005658236.

The spelling of 206431 in words is "two hundred six thousand, four hundred thirty-one".