121605143 has 8 divisors (see below), whose sum is σ = 132742800. Its totient is φ = 110481280.

The previous prime is 121605137. The next prime is 121605193. The reversal of 121605143 is 341506121.

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 121605143 - 2¹⁴ = 121588759 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 (121605103) 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, 25871 + ... + 30207.

It is an arithmetic number, because the mean of its divisors is an integer number (16592850).

Almost surely, 2^121605143 is an apocalyptic number.

121605143 is a deficient number, since it is larger than the sum of its proper divisors (11137657).

121605143 is a wasteful number, since it uses less digits than its factorization.

121605143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6897.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 121605143 is about 11027.4721944787. The cubic root of 121605143 is about 495.4319163217.

The spelling of 121605143 in words is "one hundred twenty-one million, six hundred five thousand, one hundred forty-three".