217913023 has 2 divisors, whose sum is σ = 217913024. Its totient is φ = 217913022.

The previous prime is 217912999. The next prime is 217913039. The reversal of 217913023 is 320319712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217913023 - 2²¹ = 215815871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217912982 and 217913000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217913623) 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, 108956511 + 108956512.

It is an arithmetic number, because the mean of its divisors is an integer number (108956512).

Almost surely, 2^217913023 is an apocalyptic number.

217913023 is a deficient number, since it is larger than the sum of its proper divisors (1).

217913023 is an equidigital number, since it uses as much as digits as its factorization.

217913023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 217913023 is about 14761.8773535076. The cubic root of 217913023 is about 601.7661138947.

The spelling of 217913023 in words is "two hundred seventeen million, nine hundred thirteen thousand, twenty-three".