121611689 has 4 divisors (see below), whose sum is σ = 121943424. Its totient is φ = 121279956.

The previous prime is 121611653. The next prime is 121611691. The reversal of 121611689 is 986116121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986116121 = 149 ⋅6618229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121611689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121611389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165317 + ... + 166050.

It is an arithmetic number, because the mean of its divisors is an integer number (30485856).

Almost surely, 2^121611689 is an apocalyptic number.

It is an amenable number.

121611689 is a deficient number, since it is larger than the sum of its proper divisors (331735).

121611689 is an equidigital number, since it uses as much as digits as its factorization.

121611689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331734.

The product of its digits is 5184, while the sum is 35.

The square root of 121611689 is about 11027.7689946788. The cubic root of 121611689 is about 495.4408058556.

The spelling of 121611689 in words is "one hundred twenty-one million, six hundred eleven thousand, six hundred eighty-nine".