206744981 has 2 divisors, whose sum is σ = 206744982. Its totient is φ = 206744980.

The previous prime is 206744957. The next prime is 206745013. The reversal of 206744981 is 189447602.

206744981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193488100 + 13256881 = 13910^2 + 3641^2 .

It is a cyclic number.

It is not a de Polignac number, because 206744981 - 2¹⁴ = 206728597 is a prime.

It is a super-2 number, since 2×206744981² = 85486974337380722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206744911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103372490 + 103372491.

It is an arithmetic number, because the mean of its divisors is an integer number (103372491).

Almost surely, 2^206744981 is an apocalyptic number.

It is an amenable number.

206744981 is a deficient number, since it is larger than the sum of its proper divisors (1).

206744981 is an equidigital number, since it uses as much as digits as its factorization.

206744981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 206744981 is about 14378.6293157589. The cubic root of 206744981 is about 591.3051457905.

The spelling of 206744981 in words is "two hundred six million, seven hundred forty-four thousand, nine hundred eighty-one".