216173897 has 2 divisors, whose sum is σ = 216173898. Its totient is φ = 216173896.

The previous prime is 216173873. The next prime is 216173933. The reversal of 216173897 is 798371612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167676601 + 48497296 = 12949^2 + 6964^2 .

It is a cyclic number.

It is not a de Polignac number, because 216173897 - 2¹⁸ = 215911753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216173497) 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, 108086948 + 108086949.

It is an arithmetic number, because the mean of its divisors is an integer number (108086949).

Almost surely, 2^216173897 is an apocalyptic number.

It is an amenable number.

216173897 is a deficient number, since it is larger than the sum of its proper divisors (1).

216173897 is an equidigital number, since it uses as much as digits as its factorization.

216173897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 216173897 is about 14702.8533625280. The cubic root of 216173897 is about 600.1609725499.

The spelling of 216173897 in words is "two hundred sixteen million, one hundred seventy-three thousand, eight hundred ninety-seven".