121698917 has 4 divisors (see below), whose sum is σ = 122316876. Its totient is φ = 121080960.

The previous prime is 121698851. The next prime is 121698919. The reversal of 121698917 is 719896121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 719896121 = 7 ⋅102842303.

It can be written as a sum of positive squares in 2 ways, for example, as 107516161 + 14182756 = 10369^2 + 3766^2 .

It is a cyclic number.

It is not a de Polignac number, because 121698917 - 2¹⁰ = 121697893 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 (121698919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308684 + ... + 309077.

It is an arithmetic number, because the mean of its divisors is an integer number (30579219).

Almost surely, 2^121698917 is an apocalyptic number.

It is an amenable number.

121698917 is a deficient number, since it is larger than the sum of its proper divisors (617959).

121698917 is an equidigital number, since it uses as much as digits as its factorization.

121698917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617958.

The product of its digits is 54432, while the sum is 44.

The square root of 121698917 is about 11031.7232108134. The cubic root of 121698917 is about 495.5592319229.

The spelling of 121698917 in words is "one hundred twenty-one million, six hundred ninety-eight thousand, nine hundred seventeen".