206870051 has 4 divisors (see below), whose sum is σ = 211915704. Its totient is φ = 201824400.

The previous prime is 206870039. The next prime is 206870063. The reversal of 206870051 is 150078602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150078602 = 2 ⋅75039301.

It is an interprime number because it is at equal distance from previous prime (206870039) and next prime (206870063).

It is a cyclic number.

It is not a de Polignac number, because 206870051 - 2¹⁴ = 206853667 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206869996 and 206870023.

It is not an unprimeable number, because it can be changed into a prime (206830051) 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, 2522765 + ... + 2522846.

It is an arithmetic number, because the mean of its divisors is an integer number (52978926).

Almost surely, 2^206870051 is an apocalyptic number.

206870051 is a deficient number, since it is larger than the sum of its proper divisors (5045653).

206870051 is an equidigital number, since it uses as much as digits as its factorization.

206870051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045652.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 206870051 is about 14382.9778210216. The cubic root of 206870051 is about 591.4243580786.

The spelling of 206870051 in words is "two hundred six million, eight hundred seventy thousand, fifty-one".