206157043 has 4 divisors (see below), whose sum is σ = 206505288. Its totient is φ = 205808800.

The previous prime is 206157023. The next prime is 206157047. The reversal of 206157043 is 340751602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340751602 = 2 ⋅170375801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206157043 is a prime.

It is a super-3 number, since 3×206157043³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206157047) 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, 173233 + ... + 174418.

It is an arithmetic number, because the mean of its divisors is an integer number (51626322).

Almost surely, 2^206157043 is an apocalyptic number.

206157043 is a deficient number, since it is larger than the sum of its proper divisors (348245).

206157043 is an equidigital number, since it uses as much as digits as its factorization.

206157043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348244.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 206157043 is about 14358.1699042740. The cubic root of 206157043 is about 590.7440989836.

The spelling of 206157043 in words is "two hundred six million, one hundred fifty-seven thousand, forty-three".