121886655 has 16 divisors (see below), whose sum is σ = 212747904. Its totient is φ = 59096480.

The previous prime is 121886629. The next prime is 121886669. The reversal of 121886655 is 556688121.

It is not a de Polignac number, because 121886655 - 2¹⁵ = 121853887 is a prime.

It is a super-3 number, since 3×121886655³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369189 + ... + 369518.

It is an arithmetic number, because the mean of its divisors is an integer number (13296744).

Almost surely, 2^121886655 is an apocalyptic number.

121886655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121886655 is a deficient number, since it is larger than the sum of its proper divisors (90861249).

121886655 is a wasteful number, since it uses less digits than its factorization.

121886655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738726.

The product of its digits is 115200, while the sum is 42.

The square root of 121886655 is about 11040.2289378436. The cubic root of 121886655 is about 495.8139246850.

The spelling of 121886655 in words is "one hundred twenty-one million, eight hundred eighty-six thousand, six hundred fifty-five".