206157506 has 4 divisors (see below), whose sum is σ = 309236262. Its totient is φ = 103078752.

The previous prime is 206157503. The next prime is 206157529. The reversal of 206157506 is 605751602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605751602 = 2 ⋅302875801.

It can be written as a sum of positive squares in only one way, i.e., 155875225 + 50282281 = 12485^2 + 7091^2 .

It is not an unprimeable number, because it can be changed into a prime (206157503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51539375 + ... + 51539378.

Almost surely, 2^206157506 is an apocalyptic number.

206157506 is a deficient number, since it is larger than the sum of its proper divisors (103078756).

206157506 is a wasteful number, since it uses less digits than its factorization.

206157506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103078755.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 206157506 is about 14358.1860274897. The cubic root of 206157506 is about 590.7445412262.

The spelling of 206157506 in words is "two hundred six million, one hundred fifty-seven thousand, five hundred six".