121685143 has 4 divisors (see below), whose sum is σ = 121707208. Its totient is φ = 121663080.

The previous prime is 121685129. The next prime is 121685183. The reversal of 121685143 is 341586121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 341586121 = 463 ⋅737767.

It is a cyclic number.

It is not a de Polignac number, because 121685143 - 2¹⁷ = 121554071 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 (121685183) 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, 5305 + ... + 16477.

It is an arithmetic number, because the mean of its divisors is an integer number (30426802).

Almost surely, 2^121685143 is an apocalyptic number.

121685143 is a deficient number, since it is larger than the sum of its proper divisors (22065).

121685143 is a wasteful number, since it uses less digits than its factorization.

121685143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22064.

The product of its digits is 5760, while the sum is 31.

The square root of 121685143 is about 11031.0989026479. The cubic root of 121685143 is about 495.5405352613.

The spelling of 121685143 in words is "one hundred twenty-one million, six hundred eighty-five thousand, one hundred forty-three".