206543631 has 16 divisors (see below), whose sum is σ = 315938304. Its totient is φ = 117573024.

The previous prime is 206543627. The next prime is 206543653. The reversal of 206543631 is 136345602.

It is not a de Polignac number, because 206543631 - 2² = 206543627 is a prime.

It is a super-2 number, since 2×206543631² = 85320543013328322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206543671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13176 + ... + 24221.

It is an arithmetic number, because the mean of its divisors is an integer number (19746144).

Almost surely, 2^206543631 is an apocalyptic number.

206543631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

206543631 is a deficient number, since it is larger than the sum of its proper divisors (109394673).

206543631 is a wasteful number, since it uses less digits than its factorization.

206543631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37670.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 206543631 is about 14371.6258996677. The cubic root of 206543631 is about 591.1131250664.

The spelling of 206543631 in words is "two hundred six million, five hundred forty-three thousand, six hundred thirty-one".