1312987143 has 16 divisors (see below), whose sum is σ = 1936271456. Its totient is φ = 786153600.

The previous prime is 1312987139. The next prime is 1312987187. The reversal of 1312987143 is 3417892131.

It is not a de Polignac number, because 1312987143 - 2² = 1312987139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312983143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453508 + ... + 456393.

It is an arithmetic number, because the mean of its divisors is an integer number (121016966).

Almost surely, 2^1312987143 is an apocalyptic number.

1312987143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1312987143 is a deficient number, since it is larger than the sum of its proper divisors (623284313).

1312987143 is a wasteful number, since it uses less digits than its factorization.

1312987143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909954.

The product of its digits is 36288, while the sum is 39.

The square root of 1312987143 is about 36235.1644538837. The cubic root of 1312987143 is about 1095.0152254925.

It can be divided in two parts, 13 and 12987143, that added together give a triangular number (12987156 = T₅₀₉₆).

The spelling of 1312987143 in words is "one billion, three hundred twelve million, nine hundred eighty-seven thousand, one hundred forty-three".