206972917 has 2 divisors, whose sum is σ = 206972918. Its totient is φ = 206972916.

The previous prime is 206972911. The next prime is 206972923. The reversal of 206972917 is 719279602.

It is a balanced prime because it is at equal distance from previous prime (206972911) and next prime (206972923).

It can be written as a sum of positive squares in only one way, i.e., 128278276 + 78694641 = 11326^2 + 8871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206972917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206972911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103486458 + 103486459.

It is an arithmetic number, because the mean of its divisors is an integer number (103486459).

Almost surely, 2^206972917 is an apocalyptic number.

It is an amenable number.

206972917 is a deficient number, since it is larger than the sum of its proper divisors (1).

206972917 is an equidigital number, since it uses as much as digits as its factorization.

206972917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 206972917 is about 14386.5533398379. The cubic root of 206972917 is about 591.5223702956.

The spelling of 206972917 in words is "two hundred six million, nine hundred seventy-two thousand, nine hundred seventeen".