121131550 has 48 divisors (see below), whose sum is σ = 235141200. Its totient is φ = 46368000.

The previous prime is 121131541. The next prime is 121131551. The reversal of 121131550 is 55131121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201250 + ... + 201850.

It is an arithmetic number, because the mean of its divisors is an integer number (4898775).

Almost surely, 2^121131550 is an apocalyptic number.

121131550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121131550 is a deficient number, since it is larger than the sum of its proper divisors (114009650).

121131550 is a wasteful number, since it uses less digits than its factorization.

121131550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 121131550 is about 11005.9779211118. The cubic root of 121131550 is about 494.7879239803.

Adding to 121131550 its reverse (55131121), we get a palindrome (176262671).

It can be divided in two parts, 1211 and 31550, that added together give a square (32761 = 181²).

The spelling of 121131550 in words is "one hundred twenty-one million, one hundred thirty-one thousand, five hundred fifty".