121779841 has 16 divisors (see below), whose sum is σ = 126806400. Its totient is φ = 116899200.

The previous prime is 121779817. The next prime is 121779859. The reversal of 121779841 is 148977121.

It is a cyclic number.

It is not a de Polignac number, because 121779841 - 2¹³ = 121771649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121779794 and 121779803.

It is not an unprimeable number, because it can be changed into a prime (121779941) 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 15 ways as a sum of consecutive naturals, for example, 611860 + ... + 612058.

It is an arithmetic number, because the mean of its divisors is an integer number (7925400).

Almost surely, 2^121779841 is an apocalyptic number.

It is an amenable number.

121779841 is a deficient number, since it is larger than the sum of its proper divisors (5026559).

121779841 is a wasteful number, since it uses less digits than its factorization.

121779841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456.

The product of its digits is 28224, while the sum is 40.

The square root of 121779841 is about 11035.3903872949. The cubic root of 121779841 is about 495.6690487034.

The spelling of 121779841 in words is "one hundred twenty-one million, seven hundred seventy-nine thousand, eight hundred forty-one".