206131131 has 6 divisors (see below), whose sum is σ = 297744980. Its totient is φ = 137420748.

The previous prime is 206131127. The next prime is 206131187. The reversal of 206131131 is 131131602.

206131131 is a `hidden beast` number, since 20 + 613 + 1 + 1 + 31 = 666.

It is not a de Polignac number, because 206131131 - 2² = 206131127 is a prime.

It is a super-2 number, since 2×206131131² = 84980086334678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206131631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11451721 + ... + 11451738.

Almost surely, 2^206131131 is an apocalyptic number.

206131131 is a deficient number, since it is larger than the sum of its proper divisors (91613849).

206131131 is a wasteful number, since it uses less digits than its factorization.

206131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22903465 (or 22903462 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 206131131 is about 14357.2675325077. The cubic root of 206131131 is about 590.7193476221.

Adding to 206131131 its reverse (131131602), we get a palindrome (337262733).

The spelling of 206131131 in words is "two hundred six million, one hundred thirty-one thousand, one hundred thirty-one".