201897 has 6 divisors (see below), whose sum is σ = 291642. Its totient is φ = 134592.

The previous prime is 201893. The next prime is 201907. The reversal of 201897 is 798102.

It can be written as a sum of positive squares in only one way, i.e., 197136 + 4761 = 444^2 + 69^2 .

It is not a de Polignac number, because 201897 - 2² = 201893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201897.

It is not an unprimeable number, because it can be changed into a prime (201893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11208 + ... + 11225.

It is an arithmetic number, because the mean of its divisors is an integer number (48607).

2²⁰¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

201897 is a deficient number, since it is larger than the sum of its proper divisors (89745).

201897 is a wasteful number, since it uses less digits than its factorization.

201897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22439 (or 22436 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 201897 is about 449.3295004782. The cubic root of 201897 is about 58.6646686360.

Adding to 201897 its reverse (798102), we get a palindrome (999999).

The spelling of 201897 in words is "two hundred one thousand, eight hundred ninety-seven".