207217397 has 2 divisors, whose sum is σ = 207217398. Its totient is φ = 207217396.

The previous prime is 207217379. The next prime is 207217421. The reversal of 207217397 is 793712702.

Together with previous prime (207217379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199769956 + 7447441 = 14134^2 + 2729^2 .

It is a cyclic number.

It is not a de Polignac number, because 207217397 - 2¹⁴ = 207201013 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 207217397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207217697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103608698 + 103608699.

It is an arithmetic number, because the mean of its divisors is an integer number (103608699).

Almost surely, 2^207217397 is an apocalyptic number.

It is an amenable number.

207217397 is a deficient number, since it is larger than the sum of its proper divisors (1).

207217397 is an equidigital number, since it uses as much as digits as its factorization.

207217397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 207217397 is about 14395.0476553570. The cubic root of 207217397 is about 591.7551841468.

The spelling of 207217397 in words is "two hundred seven million, two hundred seventeen thousand, three hundred ninety-seven".