121554445 has 4 divisors (see below), whose sum is σ = 145865340. Its totient is φ = 97243552.

The previous prime is 121554431. The next prime is 121554449. The reversal of 121554445 is 544455121.

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 89075844 + 32478601 = 9438^2 + 5699^2 .

It is a cyclic number.

It is not a de Polignac number, because 121554445 - 2¹⁵ = 121521677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121554449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12155440 + ... + 12155449.

It is an arithmetic number, because the mean of its divisors is an integer number (36466335).

Almost surely, 2^121554445 is an apocalyptic number.

It is an amenable number.

121554445 is a deficient number, since it is larger than the sum of its proper divisors (24310895).

121554445 is an equidigital number, since it uses as much as digits as its factorization.

121554445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24310894.

The product of its digits is 16000, while the sum is 31.

The square root of 121554445 is about 11025.1732412693. The cubic root of 121554445 is about 495.3630571215.

The spelling of 121554445 in words is "one hundred twenty-one million, five hundred fifty-four thousand, four hundred forty-five".