121706605 has 4 divisors (see below), whose sum is σ = 146047932. Its totient is φ = 97365280.

The previous prime is 121706597. The next prime is 121706623. The reversal of 121706605 is 506607121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24940036 + 96766569 = 4994^2 + 9837^2 .

It is not a de Polignac number, because 121706605 - 2³ = 121706597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12170656 + ... + 12170665.

It is an arithmetic number, because the mean of its divisors is an integer number (36511983).

Almost surely, 2^121706605 is an apocalyptic number.

It is an amenable number.

121706605 is a deficient number, since it is larger than the sum of its proper divisors (24341327).

121706605 is an equidigital number, since it uses as much as digits as its factorization.

121706605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24341326.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 121706605 is about 11032.0716549522. The cubic root of 121706605 is about 495.5696669079.

The spelling of 121706605 in words is "one hundred twenty-one million, seven hundred six thousand, six hundred five".