121805279 has 2 divisors, whose sum is σ = 121805280. Its totient is φ = 121805278.

The previous prime is 121805273. The next prime is 121805287. The reversal of 121805279 is 972508121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121805279 - 2⁸ = 121805023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121805273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60902639 + 60902640.

It is an arithmetic number, because the mean of its divisors is an integer number (60902640).

Almost surely, 2^121805279 is an apocalyptic number.

121805279 is a deficient number, since it is larger than the sum of its proper divisors (1).

121805279 is an equidigital number, since it uses as much as digits as its factorization.

121805279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 121805279 is about 11036.5428916849. The cubic root of 121805279 is about 495.7035589347.

The spelling of 121805279 in words is "one hundred twenty-one million, eight hundred five thousand, two hundred seventy-nine".