216486197 has 2 divisors, whose sum is σ = 216486198. Its totient is φ = 216486196.

The previous prime is 216486169. The next prime is 216486217. The reversal of 216486197 is 791684612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181333156 + 35153041 = 13466^2 + 5929^2 .

It is a cyclic number.

It is not a de Polignac number, because 216486197 - 2¹⁰ = 216485173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216486157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108243098 + 108243099.

It is an arithmetic number, because the mean of its divisors is an integer number (108243099).

Almost surely, 2^216486197 is an apocalyptic number.

It is an amenable number.

216486197 is a deficient number, since it is larger than the sum of its proper divisors (1).

216486197 is an equidigital number, since it uses as much as digits as its factorization.

216486197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 216486197 is about 14713.4699170522. The cubic root of 216486197 is about 600.4498450555.

The spelling of 216486197 in words is "two hundred sixteen million, four hundred eighty-six thousand, one hundred ninety-seven".