215054197 has 2 divisors, whose sum is σ = 215054198. Its totient is φ = 215054196.

The previous prime is 215054183. The next prime is 215054201. The reversal of 215054197 is 791450512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214066161 + 988036 = 14631^2 + 994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215054197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215054797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107527098 + 107527099.

It is an arithmetic number, because the mean of its divisors is an integer number (107527099).

Almost surely, 2^215054197 is an apocalyptic number.

It is an amenable number.

215054197 is a deficient number, since it is larger than the sum of its proper divisors (1).

215054197 is an equidigital number, since it uses as much as digits as its factorization.

215054197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 215054197 is about 14664.7262845237. The cubic root of 215054197 is about 599.1229751518.

The spelling of 215054197 in words is "two hundred fifteen million, fifty-four thousand, one hundred ninety-seven".