217054823 has 2 divisors, whose sum is σ = 217054824. Its totient is φ = 217054822.

The previous prime is 217054787. The next prime is 217054837. The reversal of 217054823 is 328450712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217054823 - 2¹⁶ = 216989287 is a prime.

It is a super-2 number, since 2×217054823² = 94225592375122658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 217054823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217054843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108527411 + 108527412.

It is an arithmetic number, because the mean of its divisors is an integer number (108527412).

Almost surely, 2^217054823 is an apocalyptic number.

217054823 is a deficient number, since it is larger than the sum of its proper divisors (1).

217054823 is an equidigital number, since it uses as much as digits as its factorization.

217054823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 217054823 is about 14732.7805590119. The cubic root of 217054823 is about 600.9751023967.

It can be divided in two parts, 21705 and 4823, that multiplied together give a triangular number (104683215 = T₁₄₄₆₉).

The spelling of 217054823 in words is "two hundred seventeen million, fifty-four thousand, eight hundred twenty-three".