121783 has 4 divisors (see below), whose sum is σ = 122608. Its totient is φ = 120960.

The previous prime is 121763. The next prime is 121787. The reversal of 121783 is 387121.

121783 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121783 - 2⁹ = 121271 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121787) 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 3 ways as a sum of consecutive naturals, for example, 123 + ... + 508.

It is an arithmetic number, because the mean of its divisors is an integer number (30652).

2¹²¹⁷⁸³ is an apocalyptic number.

121783 is a deficient number, since it is larger than the sum of its proper divisors (825).

121783 is an equidigital number, since it uses as much as digits as its factorization.

121783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824.

The product of its digits is 336, while the sum is 22.

The square root of 121783 is about 348.9742110816. The cubic root of 121783 is about 49.5673334593.

The spelling of 121783 in words is "one hundred twenty-one thousand, seven hundred eighty-three".