121755545 has 4 divisors (see below), whose sum is σ = 146106660. Its totient is φ = 97404432.

The previous prime is 121755523. The next prime is 121755559. The reversal of 121755545 is 545557121.

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 51380224 + 70375321 = 7168^2 + 8389^2 .

It is a cyclic number.

It is not a de Polignac number, because 121755545 - 2¹⁸ = 121493401 is a prime.

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, 12175550 + ... + 12175559.

It is an arithmetic number, because the mean of its divisors is an integer number (36526665).

Almost surely, 2^121755545 is an apocalyptic number.

It is an amenable number.

121755545 is a deficient number, since it is larger than the sum of its proper divisors (24351115).

121755545 is an equidigital number, since it uses as much as digits as its factorization.

121755545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24351114.

The product of its digits is 35000, while the sum is 35.

The square root of 121755545 is about 11034.2895104307. The cubic root of 121755545 is about 495.6360832688.

The spelling of 121755545 in words is "one hundred twenty-one million, seven hundred fifty-five thousand, five hundred forty-five".