1200235553 has 4 divisors (see below), whose sum is σ = 1309347888. Its totient is φ = 1091123220.

The previous prime is 1200235523. The next prime is 1200235579. The reversal of 1200235553 is 3555320021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3555320021 = 11 ⋅323210911.

It is not a de Polignac number, because 1200235553 - 2¹² = 1200231457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200235523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54556151 + ... + 54556172.

It is an arithmetic number, because the mean of its divisors is an integer number (327336972).

Almost surely, 2^1200235553 is an apocalyptic number.

It is an amenable number.

1200235553 is a deficient number, since it is larger than the sum of its proper divisors (109112335).

1200235553 is a wasteful number, since it uses less digits than its factorization.

1200235553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109112334.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 1200235553 is about 34644.4158992470. The cubic root of 1200235553 is about 1062.7280958597.

Adding to 1200235553 its reverse (3555320021), we get a palindrome (4755555574).

The spelling of 1200235553 in words is "one billion, two hundred million, two hundred thirty-five thousand, five hundred fifty-three".