1311455143 has 4 divisors (see below), whose sum is σ = 1311598728. Its totient is φ = 1311311560.

The previous prime is 1311455141. The next prime is 1311455149. The reversal of 1311455143 is 3415541131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311455143 - 2¹ = 1311455141 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 (1311455141) 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, 57088 + ... + 76693.

It is an arithmetic number, because the mean of its divisors is an integer number (327899682).

Almost surely, 2^1311455143 is an apocalyptic number.

1311455143 is a deficient number, since it is larger than the sum of its proper divisors (143585).

1311455143 is an equidigital number, since it uses as much as digits as its factorization.

1311455143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143584.

The product of its digits is 3600, while the sum is 28.

The square root of 1311455143 is about 36214.0185977751. The cubic root of 1311455143 is about 1094.5891699847.

Adding to 1311455143 its reverse (3415541131), we get a palindrome (4726996274).

The spelling of 1311455143 in words is "one billion, three hundred eleven million, four hundred fifty-five thousand, one hundred forty-three".