217064651 has 2 divisors, whose sum is σ = 217064652. Its totient is φ = 217064650.

The previous prime is 217064597. The next prime is 217064663. The reversal of 217064651 is 156460712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217064651 - 2¹⁸ = 216802507 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (217066651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108532325 + 108532326.

It is an arithmetic number, because the mean of its divisors is an integer number (108532326).

Almost surely, 2^217064651 is an apocalyptic number.

217064651 is a deficient number, since it is larger than the sum of its proper divisors (1).

217064651 is an equidigital number, since it uses as much as digits as its factorization.

217064651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 217064651 is about 14733.1140971622. The cubic root of 217064651 is about 600.9841727536.

The spelling of 217064651 in words is "two hundred seventeen million, sixty-four thousand, six hundred fifty-one".