120553409 has 4 divisors (see below), whose sum is σ = 127644804. Its totient is φ = 113462016.

The previous prime is 120553403. The next prime is 120553427. The reversal of 120553409 is 904355021.

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 85507009 + 35046400 = 9247^2 + 5920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120553409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (120553403) 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, 3545672 + ... + 3545705.

It is an arithmetic number, because the mean of its divisors is an integer number (31911201).

Almost surely, 2^120553409 is an apocalyptic number.

It is an amenable number.

120553409 is a deficient number, since it is larger than the sum of its proper divisors (7091395).

120553409 is an equidigital number, since it uses as much as digits as its factorization.

120553409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091394.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 120553409 is about 10979.6816438365. The cubic root of 120553409 is about 493.9994877800. Note that the first 3 decimals are identical.

The spelling of 120553409 in words is "one hundred twenty million, five hundred fifty-three thousand, four hundred nine".