121913861 has 8 divisors (see below), whose sum is σ = 128834880. Its totient is φ = 115043328.

The previous prime is 121913843. The next prime is 121913867. The reversal of 121913861 is 168319121.

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

It is not a de Polignac number, because 121913861 - 2²² = 117719557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121913867) 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, 7601 + ... + 17366.

It is an arithmetic number, because the mean of its divisors is an integer number (16104360).

Almost surely, 2^121913861 is an apocalyptic number.

It is an amenable number.

121913861 is a deficient number, since it is larger than the sum of its proper divisors (6921019).

121913861 is a wasteful number, since it uses less digits than its factorization.

121913861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25243.

The product of its digits is 2592, while the sum is 32.

The square root of 121913861 is about 11041.4609993424. The cubic root of 121913861 is about 495.8508117151.

The spelling of 121913861 in words is "one hundred twenty-one million, nine hundred thirteen thousand, eight hundred sixty-one".