121505045 has 4 divisors (see below), whose sum is σ = 145806060. Its totient is φ = 97204032.

The previous prime is 121505023. The next prime is 121505053. The reversal of 121505045 is 540505121.

It is a happy number.

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 36699364 + 84805681 = 6058^2 + 9209^2 .

It is a cyclic number.

It is not a de Polignac number, because 121505045 - 2¹⁰ = 121504021 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121505045.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12150500 + ... + 12150509.

It is an arithmetic number, because the mean of its divisors is an integer number (36451515).

Almost surely, 2^121505045 is an apocalyptic number.

It is an amenable number.

121505045 is a deficient number, since it is larger than the sum of its proper divisors (24301015).

121505045 is an equidigital number, since it uses as much as digits as its factorization.

121505045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24301014.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 121505045 is about 11022.9326859960. The cubic root of 121505045 is about 495.2959424751.

The spelling of 121505045 in words is "one hundred twenty-one million, five hundred five thousand, forty-five".