1201331143 has 4 divisors (see below), whose sum is σ = 1217787808. Its totient is φ = 1184874480.

The previous prime is 1201331123. The next prime is 1201331149. The reversal of 1201331143 is 3411331021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3411331021 = 7 ⋅487333003.

It is a cyclic number.

It is not a de Polignac number, because 1201331143 - 2¹³ = 1201322951 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 1201331143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201331149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8228223 + ... + 8228368.

It is an arithmetic number, because the mean of its divisors is an integer number (304446952).

Almost surely, 2^1201331143 is an apocalyptic number.

1201331143 is a deficient number, since it is larger than the sum of its proper divisors (16456665).

1201331143 is an equidigital number, since it uses as much as digits as its factorization.

1201331143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16456664.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1201331143 is about 34660.2242202788. The cubic root of 1201331143 is about 1063.0513546801.

Adding to 1201331143 its reverse (3411331021), we get a palindrome (4612662164).

The spelling of 1201331143 in words is "one billion, two hundred one million, three hundred thirty-one thousand, one hundred forty-three".