121541550 has 96 divisors (see below), whose sum is σ = 327499872. Its totient is φ = 29652480.

The previous prime is 121541549. The next prime is 121541573. The reversal of 121541550 is 55145121.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121541550.

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 47 ways as a sum of consecutive naturals, for example, 305952 + ... + 306348.

It is an arithmetic number, because the mean of its divisors is an integer number (3411457).

Almost surely, 2^121541550 is an apocalyptic number.

121541550 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 121541550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163749936).

121541550 is an abundant number, since it is smaller than the sum of its proper divisors (205958322).

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

121541550 is a wasteful number, since it uses less digits than its factorization.

121541550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 577 counting only the distinct ones).

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

The square root of 121541550 is about 11024.5884276920. The cubic root of 121541550 is about 495.3455397791.

Adding to 121541550 its reverse (55145121), we get a palindrome (176686671).

The spelling of 121541550 in words is "one hundred twenty-one million, five hundred forty-one thousand, five hundred fifty".