121108779 has 18 divisors (see below), whose sum is σ = 192285548. Its totient is φ = 73398600.

The previous prime is 121108759. The next prime is 121108783. The reversal of 121108779 is 977801121.

It is not a de Polignac number, because 121108779 - 2¹³ = 121100587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121108759) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 54517 + ... + 56694.

Almost surely, 2^121108779 is an apocalyptic number.

121108779 is a deficient number, since it is larger than the sum of its proper divisors (71176769).

121108779 is a wasteful number, since it uses less digits than its factorization.

121108779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111239 (or 111225 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 121108779 is about 11004.9433892229. The cubic root of 121108779 is about 494.7569176848.

It can be divided in two parts, 121 and 108779, that added together give a square (108900 = 330²).

The spelling of 121108779 in words is "one hundred twenty-one million, one hundred eight thousand, seven hundred seventy-nine".