121685793 has 4 divisors (see below), whose sum is σ = 162247728. Its totient is φ = 81123860.

The previous prime is 121685783. The next prime is 121685797. The reversal of 121685793 is 397586121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 397586121 = 3 ⋅132528707.

It is a cyclic number.

It is not a de Polignac number, because 121685793 - 2⁴ = 121685777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121685797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20280963 + ... + 20280968.

It is an arithmetic number, because the mean of its divisors is an integer number (40561932).

Almost surely, 2^121685793 is an apocalyptic number.

It is an amenable number.

121685793 is a deficient number, since it is larger than the sum of its proper divisors (40561935).

121685793 is an equidigital number, since it uses as much as digits as its factorization.

121685793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40561934.

The product of its digits is 90720, while the sum is 42.

The square root of 121685793 is about 11031.1283647685. The cubic root of 121685793 is about 495.5414175952.

The spelling of 121685793 in words is "one hundred twenty-one million, six hundred eighty-five thousand, seven hundred ninety-three".