206626081 has 4 divisors (see below), whose sum is σ = 206658964. Its totient is φ = 206593200.

The previous prime is 206626061. The next prime is 206626099. The reversal of 206626081 is 180626602.

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 62410000 + 144216081 = 7900^2 + 12009^2 .

It is a cyclic number.

It is not a de Polignac number, because 206626081 - 2⁹ = 206625569 is a prime.

It is a super-2 number, since 2×206626081² = 85388674698837122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206626061) 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, 3750 + ... + 20671.

It is an arithmetic number, because the mean of its divisors is an integer number (51664741).

Almost surely, 2^206626081 is an apocalyptic number.

It is an amenable number.

206626081 is a deficient number, since it is larger than the sum of its proper divisors (32883).

206626081 is an equidigital number, since it uses as much as digits as its factorization.

206626081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32882.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 206626081 is about 14374.4941128375. The cubic root of 206626081 is about 591.1917699404.

The spelling of 206626081 in words is "two hundred six million, six hundred twenty-six thousand, eighty-one".