209867051 has 2 divisors, whose sum is σ = 209867052. Its totient is φ = 209867050.

The previous prime is 209867039. The next prime is 209867083. The reversal of 209867051 is 150768902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209867051 - 2¹⁸ = 209604907 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 209866996 and 209867014.

It is not a weakly prime, because it can be changed into another prime (209867011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104933525 + 104933526.

It is an arithmetic number, because the mean of its divisors is an integer number (104933526).

Almost surely, 2^209867051 is an apocalyptic number.

209867051 is a deficient number, since it is larger than the sum of its proper divisors (1).

209867051 is an equidigital number, since it uses as much as digits as its factorization.

209867051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 209867051 is about 14486.7888436327. The cubic root of 209867051 is about 594.2667341172.

The spelling of 209867051 in words is "two hundred nine million, eight hundred sixty-seven thousand, fifty-one".