121860555 has 32 divisors (see below), whose sum is σ = 204180480. Its totient is φ = 61944960.

The previous prime is 121860553. The next prime is 121860559. The reversal of 121860555 is 555068121.

It is not a de Polignac number, because 121860555 - 2¹ = 121860553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121860553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144826 + ... + 145664.

It is an arithmetic number, because the mean of its divisors is an integer number (6380640).

Almost surely, 2^121860555 is an apocalyptic number.

121860555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121860555 is a deficient number, since it is larger than the sum of its proper divisors (82319925).

121860555 is a wasteful number, since it uses less digits than its factorization.

121860555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291.

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 121860555 is about 11039.0468338530. The cubic root of 121860555 is about 495.7785320567.

The spelling of 121860555 in words is "one hundred twenty-one million, eight hundred sixty thousand, five hundred fifty-five".