121897 has 4 divisors (see below), whose sum is σ = 123520. Its totient is φ = 120276.

The previous prime is 121889. The next prime is 121909. The reversal of 121897 is 798121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121897 - 2³ = 121889 is a prime.

It is a Duffinian number.

121897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (121867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (30880).

2¹²¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

121897 is a deficient number, since it is larger than the sum of its proper divisors (1623).

121897 is an equidigital number, since it uses as much as digits as its factorization.

121897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622.

The product of its digits is 1008, while the sum is 28.

The square root of 121897 is about 349.1375087269. The cubic root of 121897 is about 49.5827951514.

The spelling of 121897 in words is "one hundred twenty-one thousand, eight hundred ninety-seven".