217380967 has 2 divisors, whose sum is σ = 217380968. Its totient is φ = 217380966.

The previous prime is 217380941. The next prime is 217380979. The reversal of 217380967 is 769083712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217380967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217380067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108690483 + 108690484.

It is an arithmetic number, because the mean of its divisors is an integer number (108690484).

Almost surely, 2^217380967 is an apocalyptic number.

217380967 is a deficient number, since it is larger than the sum of its proper divisors (1).

217380967 is an equidigital number, since it uses as much as digits as its factorization.

217380967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 217380967 is about 14743.8450548017. The cubic root of 217380967 is about 601.2759577776.

The spelling of 217380967 in words is "two hundred seventeen million, three hundred eighty thousand, nine hundred sixty-seven".