121518661 has 8 divisors (see below), whose sum is σ = 139543200. Its totient is φ = 104657040.

The previous prime is 121518571. The next prime is 121518689. The reversal of 121518661 is 166815121.

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

It is a cyclic number.

It is not a de Polignac number, because 121518661 - 2¹⁷ = 121387589 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 (121510661) 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, 290506 + ... + 290923.

It is an arithmetic number, because the mean of its divisors is an integer number (17442900).

Almost surely, 2^121518661 is an apocalyptic number.

121518661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121518661 is a deficient number, since it is larger than the sum of its proper divisors (18024539).

121518661 is a wasteful number, since it uses less digits than its factorization.

121518661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581459.

The product of its digits is 2880, while the sum is 31.

The square root of 121518661 is about 11023.5502901742. The cubic root of 121518661 is about 495.3144429351.

The spelling of 121518661 in words is "one hundred twenty-one million, five hundred eighteen thousand, six hundred sixty-one".