1313031143 has 4 divisors (see below), whose sum is σ = 1313104080. Its totient is φ = 1312958208.

The previous prime is 1313031131. The next prime is 1313031197. The reversal of 1313031143 is 3411303131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3411303131 = 109 ⋅31296359.

It is a cyclic number.

It is not a de Polignac number, because 1313031143 - 2¹⁰ = 1313030119 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 (1313031943) 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, 12071 + ... + 52647.

It is an arithmetic number, because the mean of its divisors is an integer number (328276020).

Almost surely, 2^1313031143 is an apocalyptic number.

1313031143 is a deficient number, since it is larger than the sum of its proper divisors (72937).

1313031143 is an equidigital number, since it uses as much as digits as its factorization.

1313031143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72936.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 1313031143 is about 36235.7715938270. The cubic root of 1313031143 is about 1095.0274571766.

Adding to 1313031143 its reverse (3411303131), we get a palindrome (4724334274).

The spelling of 1313031143 in words is "one billion, three hundred thirteen million, thirty-one thousand, one hundred forty-three".