121351688 has 8 divisors (see below), whose sum is σ = 227534430. Its totient is φ = 60675840.

The previous prime is 121351669. The next prime is 121351733. The reversal of 121351688 is 886153121.

It can be written as a sum of positive squares in only one way, i.e., 76702564 + 44649124 = 8758^2 + 6682^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7584473 + ... + 7584488.

Almost surely, 2^121351688 is an apocalyptic number.

It is an amenable number.

121351688 is a deficient number, since it is larger than the sum of its proper divisors (106182742).

121351688 is a wasteful number, since it uses less digits than its factorization.

121351688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15168967 (or 15168963 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 121351688 is about 11015.9742192872. The cubic root of 121351688 is about 495.0874762928.

The spelling of 121351688 in words is "one hundred twenty-one million, three hundred fifty-one thousand, six hundred eighty-eight".