121780855 has 8 divisors (see below), whose sum is σ = 167013792. Its totient is φ = 83506848.

The previous prime is 121780811. The next prime is 121780871. The reversal of 121780855 is 558087121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121780855 - 2¹¹ = 121778807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1739692 + ... + 1739761.

It is an arithmetic number, because the mean of its divisors is an integer number (20876724).

Almost surely, 2^121780855 is an apocalyptic number.

121780855 is a deficient number, since it is larger than the sum of its proper divisors (45232937).

121780855 is an equidigital number, since it uses as much as digits as its factorization.

121780855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479465.

The product of its (nonzero) digits is 22400, while the sum is 37.

The square root of 121780855 is about 11035.4363302952. The cubic root of 121780855 is about 495.6704244292.

The spelling of 121780855 in words is "one hundred twenty-one million, seven hundred eighty thousand, eight hundred fifty-five".