121665727 has 8 divisors (see below), whose sum is σ = 123454800. Its totient is φ = 119889984.

The previous prime is 121665703. The next prime is 121665743. The reversal of 121665727 is 727566121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121665727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121665757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15849 + ... + 22237.

It is an arithmetic number, because the mean of its divisors is an integer number (15431850).

Almost surely, 2^121665727 is an apocalyptic number.

121665727 is a deficient number, since it is larger than the sum of its proper divisors (1789073).

121665727 is a wasteful number, since it uses less digits than its factorization.

121665727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6665.

The product of its digits is 35280, while the sum is 37.

The square root of 121665727 is about 11030.2188101597. The cubic root of 121665727 is about 495.5141778206.

The spelling of 121665727 in words is "one hundred twenty-one million, six hundred sixty-five thousand, seven hundred twenty-seven".