121749 has 4 divisors (see below), whose sum is σ = 162336. Its totient is φ = 81164.

The previous prime is 121727. The next prime is 121763. The reversal of 121749 is 947121.

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 121749 - 2⁷ = 121621 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20289 + ... + 20294.

It is an arithmetic number, because the mean of its divisors is an integer number (40584).

2¹²¹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

121749 is a deficient number, since it is larger than the sum of its proper divisors (40587).

121749 is an equidigital number, since it uses as much as digits as its factorization.

121749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40586.

The product of its digits is 504, while the sum is 24.

The square root of 121749 is about 348.9254934796. The cubic root of 121749 is about 49.5627202095.

The spelling of 121749 in words is "one hundred twenty-one thousand, seven hundred forty-nine".