121779 has 12 divisors (see below), whose sum is σ = 201136. Its totient is φ = 69552.

The previous prime is 121763. The next prime is 121787. The reversal of 121779 is 977121.

It is not a de Polignac number, because 121779 - 2⁴ = 121763 is a prime.

It is a Duffinian number.

121779 is a lucky 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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 904 + ... + 1029.

2¹²¹⁷⁷⁹ is an apocalyptic number.

121779 is a deficient number, since it is larger than the sum of its proper divisors (79357).

121779 is a wasteful number, since it uses less digits than its factorization.

121779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946 (or 1943 counting only the distinct ones).

The product of its digits is 882, while the sum is 27.

The square root of 121779 is about 348.9684799520. The cubic root of 121779 is about 49.5667907686.

It can be divided in two parts, 1217 and 79, that added together give a 4-th power (1296 = 6⁴).

The spelling of 121779 in words is "one hundred twenty-one thousand, seven hundred seventy-nine".