121611688 has 32 divisors (see below), whose sum is σ = 251184960. Its totient is φ = 54737280.

The previous prime is 121611653. The next prime is 121611691. The reversal of 121611688 is 886116121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2356 + ... + 15772.

It is an arithmetic number, because the mean of its divisors is an integer number (7849530).

Almost surely, 2^121611688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121611688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125592480).

121611688 is an abundant number, since it is smaller than the sum of its proper divisors (129573272).

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

121611688 is a wasteful number, since it uses less digits than its factorization.

121611688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13537 (or 13533 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 121611688 is about 11027.7689493388. The cubic root of 121611688 is about 495.4408044976.

The spelling of 121611688 in words is "one hundred twenty-one million, six hundred eleven thousand, six hundred eighty-eight".