121559988 has 36 divisors (see below), whose sum is σ = 311773280. Its totient is φ = 36835920.

The previous prime is 121559981. The next prime is 121559989. The reversal of 121559988 is 889955121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121559981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40408 + ... + 43311.

Almost surely, 2^121559988 is an apocalyptic number.

It is an amenable number.

121559988 is an abundant number, since it is smaller than the sum of its proper divisors (190213292).

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

121559988 is a wasteful number, since it uses less digits than its factorization.

121559988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83748 (or 83735 counting only the distinct ones).

The product of its digits is 259200, while the sum is 48.

The square root of 121559988 is about 11025.4246176735. The cubic root of 121559988 is about 495.3705866849.

The spelling of 121559988 in words is "one hundred twenty-one million, five hundred fifty-nine thousand, nine hundred eighty-eight".