121845 has 8 divisors (see below), whose sum is σ = 194976. Its totient is φ = 64976.

The previous prime is 121843. The next prime is 121853. The reversal of 121845 is 548121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121845 - 2¹ = 121843 is a prime.

121845 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4047 + ... + 4076.

It is an arithmetic number, because the mean of its divisors is an integer number (24372).

2¹²¹⁸⁴⁵ is an apocalyptic number.

121845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121845 is a deficient number, since it is larger than the sum of its proper divisors (73131).

121845 is an equidigital number, since it uses as much as digits as its factorization.

121845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8131.

The product of its digits is 320, while the sum is 21.

The square root of 121845 is about 349.0630315573. The cubic root of 121845 is about 49.5757436460.

Adding to 121845 its reverse (548121), we get a palindrome (669966).

The spelling of 121845 in words is "one hundred twenty-one thousand, eight hundred forty-five".