206081731 has 2 divisors, whose sum is σ = 206081732. Its totient is φ = 206081730.

The previous prime is 206081717. The next prime is 206081737. The reversal of 206081731 is 137180602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206081731 - 2¹¹ = 206079683 is a prime.

It is a super-2 number, since 2×206081731² = 84939359703912722, 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 206081731.

It is not a weakly prime, because it can be changed into another prime (206081737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103040865 + 103040866.

It is an arithmetic number, because the mean of its divisors is an integer number (103040866).

Almost surely, 2^206081731 is an apocalyptic number.

206081731 is a deficient number, since it is larger than the sum of its proper divisors (1).

206081731 is an equidigital number, since it uses as much as digits as its factorization.

206081731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 206081731 is about 14355.5470463511. The cubic root of 206081731 is about 590.6721545771.

The spelling of 206081731 in words is "two hundred six million, eighty-one thousand, seven hundred thirty-one".