121656727 has 4 divisors (see below), whose sum is σ = 124245216. Its totient is φ = 119068240.

The previous prime is 121656719. The next prime is 121656737. The reversal of 121656727 is 727656121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121656727 - 2³ = 121656719 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121656707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294174 + ... + 1294267.

It is an arithmetic number, because the mean of its divisors is an integer number (31061304).

Almost surely, 2^121656727 is an apocalyptic number.

121656727 is a deficient number, since it is larger than the sum of its proper divisors (2588489).

121656727 is an equidigital number, since it uses as much as digits as its factorization.

121656727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588488.

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

The square root of 121656727 is about 11029.8108324667. The cubic root of 121656727 is about 495.5019592672.

The spelling of 121656727 in words is "one hundred twenty-one million, six hundred fifty-six thousand, seven hundred twenty-seven".