206639031 has 8 divisors (see below), whose sum is σ = 278247024. Its totient is φ = 136395200.

The previous prime is 206638973. The next prime is 206639053. The reversal of 206639031 is 130936602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206639031 - 2⁶ = 206638967 is a prime.

It is a super-2 number, since 2×206639031² = 85399378265237922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206639031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206635031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340686 + ... + 341291.

It is an arithmetic number, because the mean of its divisors is an integer number (34780878).

Almost surely, 2^206639031 is an apocalyptic number.

206639031 is a deficient number, since it is larger than the sum of its proper divisors (71607993).

206639031 is a wasteful number, since it uses less digits than its factorization.

206639031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682081.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 206639031 is about 14374.9445564148. The cubic root of 206639031 is about 591.2041203875.

The spelling of 206639031 in words is "two hundred six million, six hundred thirty-nine thousand, thirty-one".