121997 has 2 divisors, whose sum is σ = 121998. Its totient is φ = 121996.

The previous prime is 121993. The next prime is 122011. The reversal of 121997 is 799121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121801 + 196 = 349^2 + 14^2 .

121997 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 121997 - 2² = 121993 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 (121993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60998 + 60999.

It is an arithmetic number, because the mean of its divisors is an integer number (60999).

2¹²¹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121997 is an equidigital number, since it uses as much as digits as its factorization.

121997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 29.

The square root of 121997 is about 349.2806894176. The cubic root of 121997 is about 49.5963501043.

The spelling of 121997 in words is "one hundred twenty-one thousand, nine hundred ninety-seven".