121705523 has 4 divisors (see below), whose sum is σ = 124535928. Its totient is φ = 118875120.

The previous prime is 121705477. The next prime is 121705537. The reversal of 121705523 is 325507121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121705523 - 2⁶ = 121705459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121705492 and 121705501.

It is not an unprimeable number, because it can be changed into a prime (121705223) 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, 1415138 + ... + 1415223.

It is an arithmetic number, because the mean of its divisors is an integer number (31133982).

Almost surely, 2^121705523 is an apocalyptic number.

121705523 is a deficient number, since it is larger than the sum of its proper divisors (2830405).

121705523 is an equidigital number, since it uses as much as digits as its factorization.

121705523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830404.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 121705523 is about 11032.0226160029. The cubic root of 121705523 is about 495.5681983271.

The spelling of 121705523 in words is "one hundred twenty-one million, seven hundred five thousand, five hundred twenty-three".