1201040553 has 4 divisors (see below), whose sum is σ = 1601387408. Its totient is φ = 800693700.

The previous prime is 1201040549. The next prime is 1201040557. The reversal of 1201040553 is 3550401021.

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: 3550401021 = 3 ⋅1183467007.

It is an interprime number because it is at equal distance from previous prime (1201040549) and next prime (1201040557).

It is not a de Polignac number, because 1201040553 - 2² = 1201040549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201040557) 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, 200173423 + ... + 200173428.

It is an arithmetic number, because the mean of its divisors is an integer number (400346852).

Almost surely, 2^1201040553 is an apocalyptic number.

It is an amenable number.

1201040553 is a deficient number, since it is larger than the sum of its proper divisors (400346855).

1201040553 is an equidigital number, since it uses as much as digits as its factorization.

1201040553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400346854.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1201040553 is about 34656.0319857886. The cubic root of 1201040553 is about 1062.9656339344.

Adding to 1201040553 its reverse (3550401021), we get a palindrome (4751441574).

The spelling of 1201040553 in words is "one billion, two hundred one million, forty thousand, five hundred fifty-three".