121717172 has 6 divisors (see below), whose sum is σ = 213005058. Its totient is φ = 60858584.

The previous prime is 121717163. The next prime is 121717199. The reversal of 121717172 is 271717121.

It can be written as a sum of positive squares in only one way, i.e., 116726416 + 4990756 = 10804^2 + 2234^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15214643 + ... + 15214650.

It is an arithmetic number, because the mean of its divisors is an integer number (35500843).

Almost surely, 2^121717172 is an apocalyptic number.

It is an amenable number.

121717172 is a deficient number, since it is larger than the sum of its proper divisors (91287886).

121717172 is a wasteful number, since it uses less digits than its factorization.

121717172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30429297 (or 30429295 counting only the distinct ones).

The product of its digits is 1372, while the sum is 29.

The square root of 121717172 is about 11032.5505663922. The cubic root of 121717172 is about 495.5840088661.

The spelling of 121717172 in words is "one hundred twenty-one million, seven hundred seventeen thousand, one hundred seventy-two".