206972891 has 2 divisors, whose sum is σ = 206972892. Its totient is φ = 206972890.

The previous prime is 206972869. The next prime is 206972893. The reversal of 206972891 is 198279602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206972891 - 2⁶ = 206972827 is a prime.

It is a Sophie Germain prime.

Together with 206972893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206972893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103486445 + 103486446.

It is an arithmetic number, because the mean of its divisors is an integer number (103486446).

Almost surely, 2^206972891 is an apocalyptic number.

206972891 is a deficient number, since it is larger than the sum of its proper divisors (1).

206972891 is an equidigital number, since it uses as much as digits as its factorization.

206972891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 206972891 is about 14386.5524362163. The cubic root of 206972891 is about 591.5223455265.

The spelling of 206972891 in words is "two hundred six million, nine hundred seventy-two thousand, eight hundred ninety-one".