121879779 has 16 divisors (see below), whose sum is σ = 192126720. Its totient is φ = 67243680.

The previous prime is 121879777. The next prime is 121879799. The reversal of 121879779 is 977978121.

It is a happy number.

It is not a de Polignac number, because 121879779 - 2¹ = 121879777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121879777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99457 + ... + 100674.

It is an arithmetic number, because the mean of its divisors is an integer number (12007920).

Almost surely, 2^121879779 is an apocalyptic number.

121879779 is a deficient number, since it is larger than the sum of its proper divisors (70246941).

121879779 is a wasteful number, since it uses less digits than its factorization.

121879779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200170.

The product of its digits is 444528, while the sum is 51.

The square root of 121879779 is about 11039.9175268659. The cubic root of 121879779 is about 495.8046010483.

The spelling of 121879779 in words is "one hundred twenty-one million, eight hundred seventy-nine thousand, seven hundred seventy-nine".