121978279 has 6 divisors (see below), whose sum is σ = 122757936. Its totient is φ = 121203540.

The previous prime is 121978277. The next prime is 121978313. The reversal of 121978279 is 972879121.

It is not a de Polignac number, because 121978279 - 2¹ = 121978277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121978277) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24274 + ... + 28864.

It is an arithmetic number, because the mean of its divisors is an integer number (20459656).

Almost surely, 2^121978279 is an apocalyptic number.

121978279 is a deficient number, since it is larger than the sum of its proper divisors (779657).

121978279 is an frugal number, since it uses more digits than its factorization.

121978279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4917 (or 4754 counting only the distinct ones).

The product of its digits is 127008, while the sum is 46.

The square root of 121978279 is about 11044.3777099482. The cubic root of 121978279 is about 495.9381304528.

The spelling of 121978279 in words is "one hundred twenty-one million, nine hundred seventy-eight thousand, two hundred seventy-nine".