121145 has 4 divisors (see below), whose sum is σ = 145380. Its totient is φ = 96912.

The previous prime is 121139. The next prime is 121151. The reversal of 121145 is 541121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (121139) and next prime (121151).

It can be written as a sum of positive squares in 2 ways, for example, as 26896 + 94249 = 164^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 121145 - 2⁶ = 121081 is a prime.

It is a super-3 number, since 3×121145³ = 5333812410370875, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12110 + ... + 12119.

It is an arithmetic number, because the mean of its divisors is an integer number (36345).

2¹²¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

121145 is a deficient number, since it is larger than the sum of its proper divisors (24235).

121145 is an equidigital number, since it uses as much as digits as its factorization.

121145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24234.

The product of its digits is 40, while the sum is 14.

The square root of 121145 is about 348.0589030610. The cubic root of 121145 is about 49.4806236444.

Adding to 121145 its reverse (541121), we get a palindrome (662266).

The spelling of 121145 in words is "one hundred twenty-one thousand, one hundred forty-five".