121691125769 has 8 divisors (see below), whose sum is σ = 121947686400. Its totient is φ = 121434768000.

The previous prime is 121691125747. The next prime is 121691125811. The reversal of 121691125769 is 967521196121.

It is a happy number.

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 121691125769 - 2¹⁶ = 121691060233 is a prime.

It is a super-2 number, since 2×121691125769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121691125069) 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 7 ways as a sum of consecutive naturals, for example, 1181657 + ... + 1280505.

It is an arithmetic number, because the mean of its divisors is an integer number (15243460800).

Almost surely, 2^121691125769 is an apocalyptic number.

It is an amenable number.

121691125769 is a deficient number, since it is larger than the sum of its proper divisors (256560631).

121691125769 is an equidigital number, since it uses as much as digits as its factorization.

121691125769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101431.

The product of its digits is 408240, while the sum is 50.

The spelling of 121691125769 in words is "one hundred twenty-one billion, six hundred ninety-one million, one hundred twenty-five thousand, seven hundred sixty-nine".