121611550 has 24 divisors (see below), whose sum is σ = 226487736. Its totient is φ = 48582240.

The previous prime is 121611527. The next prime is 121611551. The reversal of 121611550 is 55116121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121611551) 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 11 ways as a sum of consecutive naturals, for example, 75352 + ... + 76948.

It is an arithmetic number, because the mean of its divisors is an integer number (9436989).

Almost surely, 2^121611550 is an apocalyptic number.

121611550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121611550 is a deficient number, since it is larger than the sum of its proper divisors (104876186).

121611550 is a wasteful number, since it uses less digits than its factorization.

121611550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 121611550 is about 11027.7626924050. The cubic root of 121611550 is about 495.4406170955.

Adding to 121611550 its reverse (55116121), we get a palindrome (176727671).

The spelling of 121611550 in words is "one hundred twenty-one million, six hundred eleven thousand, five hundred fifty".