206248691 has 4 divisors (see below), whose sum is σ = 224998584. Its totient is φ = 187498800.

The previous prime is 206248663. The next prime is 206248699. The reversal of 206248691 is 196842602.

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

It is a cyclic number.

It is not a de Polignac number, because 206248691 - 2¹⁴ = 206232307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206248699) 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, 9374930 + ... + 9374951.

It is an arithmetic number, because the mean of its divisors is an integer number (56249646).

Almost surely, 2^206248691 is an apocalyptic number.

206248691 is a deficient number, since it is larger than the sum of its proper divisors (18749893).

206248691 is a wasteful number, since it uses less digits than its factorization.

206248691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18749892.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 206248691 is about 14361.3610427424. The cubic root of 206248691 is about 590.8316252913.

The spelling of 206248691 in words is "two hundred six million, two hundred forty-eight thousand, six hundred ninety-one".