121769550 has 288 divisors, whose sum is σ = 408545280. Its totient is φ = 25401600.

The previous prime is 121769513. The next prime is 121769551. The reversal of 121769550 is 55967121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121769551) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2831829 + ... + 2831871.

It is an arithmetic number, because the mean of its divisors is an integer number (1418560).

Almost surely, 2^121769550 is an apocalyptic number.

121769550 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 121769550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204272640).

121769550 is an abundant number, since it is smaller than the sum of its proper divisors (286775730).

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

121769550 is a wasteful number, since it uses less digits than its factorization.

121769550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 121769550 is about 11034.9241048591. The cubic root of 121769550 is about 495.6550861465.

The spelling of 121769550 in words is "one hundred twenty-one million, seven hundred sixty-nine thousand, five hundred fifty".