121551516 has 36 divisors (see below), whose sum is σ = 318637592. Its totient is φ = 40516848.

The previous prime is 121551509. The next prime is 121551517. The reversal of 121551516 is 615155121.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 121551516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121551517) 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, 61555 + ... + 63498.

Almost surely, 2^121551516 is an apocalyptic number.

It is an amenable number.

121551516 is an abundant number, since it is smaller than the sum of its proper divisors (197086076).

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

121551516 is a wasteful number, since it uses less digits than its factorization.

121551516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125072 (or 125058 counting only the distinct ones).

The product of its digits is 1500, while the sum is 27.

The square root of 121551516 is about 11025.0404080892. The cubic root of 121551516 is about 495.3590783007.

The spelling of 121551516 in words is "one hundred twenty-one million, five hundred fifty-one thousand, five hundred sixteen".