121550143 has 16 divisors (see below), whose sum is σ = 146666016. Its totient is φ = 99239040.

The previous prime is 121550123. The next prime is 121550159. The reversal of 121550143 is 341055121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121550143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121550123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6196 + ... + 16777.

It is an arithmetic number, because the mean of its divisors is an integer number (9166626).

Almost surely, 2^121550143 is an apocalyptic number.

121550143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121550143 is a deficient number, since it is larger than the sum of its proper divisors (25115873).

121550143 is a wasteful number, since it uses less digits than its factorization.

121550143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23034.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 121550143 is about 11024.9781405679. The cubic root of 121550143 is about 495.3572131641.

The spelling of 121550143 in words is "one hundred twenty-one million, five hundred fifty thousand, one hundred forty-three".