206715137 has 2 divisors, whose sum is σ = 206715138. Its totient is φ = 206715136.

The previous prime is 206715083. The next prime is 206715181. The reversal of 206715137 is 731517602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196672576 + 10042561 = 14024^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 206715137 - 2⁸ = 206714881 is a prime.

It is a super-2 number, since 2×206715137² = 85462295729857538, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206715437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103357568 + 103357569.

It is an arithmetic number, because the mean of its divisors is an integer number (103357569).

Almost surely, 2^206715137 is an apocalyptic number.

It is an amenable number.

206715137 is a deficient number, since it is larger than the sum of its proper divisors (1).

206715137 is an equidigital number, since it uses as much as digits as its factorization.

206715137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 206715137 is about 14377.5914881457. The cubic root of 206715137 is about 591.2766924436.

The spelling of 206715137 in words is "two hundred six million, seven hundred fifteen thousand, one hundred thirty-seven".