206211851 has 2 divisors, whose sum is σ = 206211852. Its totient is φ = 206211850.

The previous prime is 206211821. The next prime is 206211857. The reversal of 206211851 is 158112602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206211851 - 2²² = 202017547 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206211851.

It is not a weakly prime, because it can be changed into another prime (206211857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103105925 + 103105926.

It is an arithmetic number, because the mean of its divisors is an integer number (103105926).

Almost surely, 2^206211851 is an apocalyptic number.

206211851 is a deficient number, since it is larger than the sum of its proper divisors (1).

206211851 is an equidigital number, since it uses as much as digits as its factorization.

206211851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 206211851 is about 14360.0783772234. The cubic root of 206211851 is about 590.7964452165.

The spelling of 206211851 in words is "two hundred six million, two hundred eleven thousand, eight hundred fifty-one".