217166051 has 2 divisors, whose sum is σ = 217166052. Its totient is φ = 217166050.

The previous prime is 217166009. The next prime is 217166077. The reversal of 217166051 is 150661712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217166051 - 2¹⁰ = 217165027 is a prime.

It is a super-2 number, since 2×217166051² = 94322187413869202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (217160051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108583025 + 108583026.

It is an arithmetic number, because the mean of its divisors is an integer number (108583026).

Almost surely, 2^217166051 is an apocalyptic number.

217166051 is a deficient number, since it is larger than the sum of its proper divisors (1).

217166051 is an equidigital number, since it uses as much as digits as its factorization.

217166051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 217166051 is about 14736.5549230477. The cubic root of 217166051 is about 601.0777398209.

The spelling of 217166051 in words is "two hundred seventeen million, one hundred sixty-six thousand, fifty-one".