121889279 has 2 divisors, whose sum is σ = 121889280. Its totient is φ = 121889278.

The previous prime is 121889263. The next prime is 121889309. The reversal of 121889279 is 972988121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121889279 - 2⁴ = 121889263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121889249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60944639 + 60944640.

It is an arithmetic number, because the mean of its divisors is an integer number (60944640).

Almost surely, 2^121889279 is an apocalyptic number.

121889279 is a deficient number, since it is larger than the sum of its proper divisors (1).

121889279 is an equidigital number, since it uses as much as digits as its factorization.

121889279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The square root of 121889279 is about 11040.3477753194. The cubic root of 121889279 is about 495.8174826528.

The spelling of 121889279 in words is "one hundred twenty-one million, eight hundred eighty-nine thousand, two hundred seventy-nine".