121841917 has 4 divisors (see below), whose sum is σ = 121864156. Its totient is φ = 121819680.

The previous prime is 121841897. The next prime is 121841947. The reversal of 121841917 is 719148121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 719148121 = 1229 ⋅585149.

It can be written as a sum of positive squares in 2 ways, for example, as 77898276 + 43943641 = 8826^2 + 6629^2 .

It is a cyclic number.

It is not a de Polignac number, because 121841917 - 2¹¹ = 121839869 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 (121841947) 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, 3553 + ... + 16009.

It is an arithmetic number, because the mean of its divisors is an integer number (30466039).

Almost surely, 2^121841917 is an apocalyptic number.

It is an amenable number.

121841917 is a deficient number, since it is larger than the sum of its proper divisors (22239).

121841917 is an equidigital number, since it uses as much as digits as its factorization.

121841917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22238.

The product of its digits is 4032, while the sum is 34.

The square root of 121841917 is about 11038.2026163683. The cubic root of 121841917 is about 495.7532551014.

The spelling of 121841917 in words is "one hundred twenty-one million, eight hundred forty-one thousand, nine hundred seventeen".