206370137 has 4 divisors (see below), whose sum is σ = 209753316. Its totient is φ = 202986960.

The previous prime is 206370133. The next prime is 206370139. The reversal of 206370137 is 731073602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97042201 + 109327936 = 9851^2 + 10456^2 .

It is a cyclic number.

It is not a de Polignac number, because 206370137 - 2² = 206370133 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206370133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1691498 + ... + 1691619.

It is an arithmetic number, because the mean of its divisors is an integer number (52438329).

Almost surely, 2^206370137 is an apocalyptic number.

It is an amenable number.

206370137 is a deficient number, since it is larger than the sum of its proper divisors (3383179).

206370137 is an equidigital number, since it uses as much as digits as its factorization.

206370137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383178.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 206370137 is about 14365.5886409155. The cubic root of 206370137 is about 590.9475695560.

The spelling of 206370137 in words is "two hundred six million, three hundred seventy thousand, one hundred thirty-seven".