1203116553 has 6 divisors (see below), whose sum is σ = 1737835034. Its totient is φ = 802077696.

The previous prime is 1203116549. The next prime is 1203116561. The reversal of 1203116553 is 3556113021.

1203116553 is a `hidden beast` number, since 1 + 2 + 0 + 3 + 1 + 1 + 655 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1200830409 + 2286144 = 34653^2 + 1512^2 .

It is not a de Polignac number, because 1203116553 - 2² = 1203116549 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 (1203116573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66839800 + ... + 66839817.

Almost surely, 2^1203116553 is an apocalyptic number.

It is an amenable number.

1203116553 is a deficient number, since it is larger than the sum of its proper divisors (534718481).

1203116553 is a wasteful number, since it uses less digits than its factorization.

1203116553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133679623 (or 133679620 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1203116553 is about 34685.9705500653. The cubic root of 1203116553 is about 1063.5777271821.

Adding to 1203116553 its reverse (3556113021), we get a palindrome (4759229574).

The spelling of 1203116553 in words is "one billion, two hundred three million, one hundred sixteen thousand, five hundred fifty-three".