12120553 has 4 divisors (see below), whose sum is σ = 12190788. Its totient is φ = 12050320.

The previous prime is 12120533. The next prime is 12120569. The reversal of 12120553 is 35502121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35502121 = 1061 ⋅33461.

It can be written as a sum of positive squares in 2 ways, for example, as 7441984 + 4678569 = 2728^2 + 2163^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120553 - 2¹³ = 12112361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12120553.

It is not an unprimeable number, because it can be changed into a prime (12120503) 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, 34858 + ... + 35203.

It is an arithmetic number, because the mean of its divisors is an integer number (3047697).

Almost surely, 2^12120553 is an apocalyptic number.

It is an amenable number.

12120553 is a deficient number, since it is larger than the sum of its proper divisors (70235).

12120553 is an equidigital number, since it uses as much as digits as its factorization.

12120553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70234.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 12120553 is about 3481.4584587497. The cubic root of 12120553 is about 229.7069550800.

Adding to 12120553 its reverse (35502121), we get a palindrome (47622674).

The spelling of 12120553 in words is "twelve million, one hundred twenty thousand, five hundred fifty-three".