1201235543 has 4 divisors (see below), whose sum is σ = 1212898128. Its totient is φ = 1189572960.

The previous prime is 1201235533. The next prime is 1201235551. The reversal of 1201235543 is 3455321021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3455321021 = 38329 ⋅90149.

It is a cyclic number.

It is not a de Polignac number, because 1201235543 - 2¹⁰ = 1201234519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201235533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5831138 + ... + 5831343.

It is an arithmetic number, because the mean of its divisors is an integer number (303224532).

Almost surely, 2^1201235543 is an apocalyptic number.

1201235543 is a deficient number, since it is larger than the sum of its proper divisors (11662585).

1201235543 is a wasteful number, since it uses less digits than its factorization.

1201235543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11662584.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1201235543 is about 34658.8450903950. The cubic root of 1201235543 is about 1063.0231552931.

Adding to 1201235543 its reverse (3455321021), we get a palindrome (4656556564).

The spelling of 1201235543 in words is "one billion, two hundred one million, two hundred thirty-five thousand, five hundred forty-three".