217349051 has 2 divisors, whose sum is σ = 217349052. Its totient is φ = 217349050.

The previous prime is 217349021. The next prime is 217349087. The reversal of 217349051 is 150943712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217349051 - 2¹⁴ = 217332667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217348999 and 217349017.

It is not a weakly prime, because it can be changed into another prime (217349021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108674525 + 108674526.

It is an arithmetic number, because the mean of its divisors is an integer number (108674526).

Almost surely, 2^217349051 is an apocalyptic number.

217349051 is a deficient number, since it is larger than the sum of its proper divisors (1).

217349051 is an equidigital number, since it uses as much as digits as its factorization.

217349051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 217349051 is about 14742.7626651181. The cubic root of 217349051 is about 601.2465297754.

The spelling of 217349051 in words is "two hundred seventeen million, three hundred forty-nine thousand, fifty-one".