206772749 has 2 divisors, whose sum is σ = 206772750. Its totient is φ = 206772748.

The previous prime is 206772743. The next prime is 206772773. The reversal of 206772749 is 947277602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178756900 + 28015849 = 13370^2 + 5293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206772749 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206772743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103386374 + 103386375.

It is an arithmetic number, because the mean of its divisors is an integer number (103386375).

Almost surely, 2^206772749 is an apocalyptic number.

It is an amenable number.

206772749 is a deficient number, since it is larger than the sum of its proper divisors (1).

206772749 is an equidigital number, since it uses as much as digits as its factorization.

206772749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 206772749 is about 14379.5948830278. The cubic root of 206772749 is about 591.3316174146.

The spelling of 206772749 in words is "two hundred six million, seven hundred seventy-two thousand, seven hundred forty-nine".