121154550 has 96 divisors (see below), whose sum is σ = 331478784. Its totient is φ = 29040000.

The previous prime is 121154513. The next prime is 121154557. The reversal of 121154550 is 55451121.

It is a self number, because there is not a number n which added to its sum of digits gives 121154550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121154557) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 166287 + ... + 167013.

It is an arithmetic number, because the mean of its divisors is an integer number (3452904).

Almost surely, 2^121154550 is an apocalyptic number.

121154550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121154550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165739392).

121154550 is an abundant number, since it is smaller than the sum of its proper divisors (210324234).

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

121154550 is a wasteful number, since it uses less digits than its factorization.

121154550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 121154550 is about 11007.0227582212. The cubic root of 121154550 is about 494.8192381509.

The spelling of 121154550 in words is "one hundred twenty-one million, one hundred fifty-four thousand, five hundred fifty".