215340197 has 2 divisors, whose sum is σ = 215340198. Its totient is φ = 215340196.

The previous prime is 215340161. The next prime is 215340233. The reversal of 215340197 is 791043512.

It is a balanced prime because it is at equal distance from previous prime (215340161) and next prime (215340233).

It can be written as a sum of positive squares in only one way, i.e., 208109476 + 7230721 = 14426^2 + 2689^2 .

It is a cyclic number.

It is not a de Polignac number, because 215340197 - 2⁸ = 215339941 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 (215340107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107670098 + 107670099.

It is an arithmetic number, because the mean of its divisors is an integer number (107670099).

Almost surely, 2^215340197 is an apocalyptic number.

It is an amenable number.

215340197 is a deficient number, since it is larger than the sum of its proper divisors (1).

215340197 is an equidigital number, since it uses as much as digits as its factorization.

215340197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 215340197 is about 14674.4743347079. The cubic root of 215340197 is about 599.3884481820.

The spelling of 215340197 in words is "two hundred fifteen million, three hundred forty thousand, one hundred ninety-seven".