121988069 has 16 divisors (see below), whose sum is σ = 144301056. Its totient is φ = 100915200.

The previous prime is 121988057. The next prime is 121988081. The reversal of 121988069 is 960889121.

It is an interprime number because it is at equal distance from previous prime (121988057) and next prime (121988081).

It is a cyclic number.

It is not a de Polignac number, because 121988069 - 2⁸ = 121987813 is a prime.

It is a super-2 number, since 2×121988069² = 29762177956697522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121988029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138659 + ... + 139535.

It is an arithmetic number, because the mean of its divisors is an integer number (9018816).

Almost surely, 2^121988069 is an apocalyptic number.

It is an amenable number.

121988069 is a deficient number, since it is larger than the sum of its proper divisors (22312987).

121988069 is an equidigital number, since it uses as much as digits as its factorization.

121988069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 121988069 is about 11044.8209129890. The cubic root of 121988069 is about 495.9513981276.

The spelling of 121988069 in words is "one hundred twenty-one million, nine hundred eighty-eight thousand, sixty-nine".