1311203142 has 12 divisors (see below), whose sum is σ = 2840940180. Its totient is φ = 437067708.

The previous prime is 1311203141. The next prime is 1311203143. The reversal of 1311203142 is 2413021131.

It is an interprime number because it is at equal distance from previous prime (1311203141) and next prime (1311203143).

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 72844619 = 1311203142 / (1 + 3 + 1 + 1 + 2 + 0 + 3 + 1 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311203141) 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 5 ways as a sum of consecutive naturals, for example, 36422292 + ... + 36422327.

It is an arithmetic number, because the mean of its divisors is an integer number (236745015).

Almost surely, 2^1311203142 is an apocalyptic number.

1311203142 is an abundant number, since it is smaller than the sum of its proper divisors (1529737038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311203142 is a wasteful number, since it uses less digits than its factorization.

1311203142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72844627 (or 72844624 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1311203142 is about 36210.5391012064. The cubic root of 1311203142 is about 1094.5190556956.

Adding to 1311203142 its reverse (2413021131), we get a palindrome (3724224273).

The spelling of 1311203142 in words is "one billion, three hundred eleven million, two hundred three thousand, one hundred forty-two".