121551544 has 8 divisors (see below), whose sum is σ = 227909160. Its totient is φ = 60775768.

The previous prime is 121551517. The next prime is 121551553. The reversal of 121551544 is 445155121.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 7596964 + ... + 7596979.

It is an arithmetic number, because the mean of its divisors is an integer number (28488645).

Almost surely, 2^121551544 is an apocalyptic number.

It is an amenable number.

121551544 is a deficient number, since it is larger than the sum of its proper divisors (106357616).

121551544 is a wasteful number, since it uses less digits than its factorization.

121551544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15193949 (or 15193945 counting only the distinct ones).

The product of its digits is 4000, while the sum is 28.

The square root of 121551544 is about 11025.0416779258. The cubic root of 121551544 is about 495.3591163369.

The spelling of 121551544 in words is "one hundred twenty-one million, five hundred fifty-one thousand, five hundred forty-four".