206712137 has 8 divisors (see below), whose sum is σ = 215512704. Its totient is φ = 198093168.

The previous prime is 206712131. The next prime is 206712139. The reversal of 206712137 is 731217602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206712137 - 2¹⁸ = 206449993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206712131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43073 + ... + 47630.

It is an arithmetic number, because the mean of its divisors is an integer number (26939088).

Almost surely, 2^206712137 is an apocalyptic number.

It is an amenable number.

206712137 is a deficient number, since it is larger than the sum of its proper divisors (8800567).

206712137 is an equidigital number, since it uses as much as digits as its factorization.

206712137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90799.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 206712137 is about 14377.4871587493. The cubic root of 206712137 is about 591.2738320844.

Adding to 206712137 its reverse (731217602), we get a palindrome (937929739).

The spelling of 206712137 in words is "two hundred six million, seven hundred twelve thousand, one hundred thirty-seven".