121554550 has 48 divisors (see below), whose sum is σ = 249202800. Its totient is φ = 43827840.

The previous prime is 121554541. The next prime is 121554569. The reversal of 121554550 is 55455121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25776 + ... + 30124.

It is an arithmetic number, because the mean of its divisors is an integer number (5191725).

Almost surely, 2^121554550 is an apocalyptic number.

121554550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121554550 is an abundant number, since it is smaller than the sum of its proper divisors (127648250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121554550 is a wasteful number, since it uses less digits than its factorization.

121554550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4417 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 121554550 is about 11025.1780030982. The cubic root of 121554550 is about 495.3631997547.

The spelling of 121554550 in words is "one hundred twenty-one million, five hundred fifty-four thousand, five hundred fifty".