206642631 has 16 divisors (see below), whose sum is σ = 297196256. Its totient is φ = 126959616.

The previous prime is 206642593. The next prime is 206642677. The reversal of 206642631 is 136246602.

206642631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206642631 - 2⁶ = 206642567 is a prime.

It is a super-2 number, since 2×206642631² = 85402353893204322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206642231) 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, 22311 + ... + 30183.

It is an arithmetic number, because the mean of its divisors is an integer number (18574766).

Almost surely, 2^206642631 is an apocalyptic number.

206642631 is a deficient number, since it is larger than the sum of its proper divisors (90553625).

206642631 is a wasteful number, since it uses less digits than its factorization.

206642631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8562.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 206642631 is about 14375.0697737437. The cubic root of 206642631 is about 591.2075536248.

The spelling of 206642631 in words is "two hundred six million, six hundred forty-two thousand, six hundred thirty-one".