1311243102 has 24 divisors (see below), whose sum is σ = 3059567784. Its totient is φ = 403459344.

The previous prime is 1311243071. The next prime is 1311243103. The reversal of 1311243102 is 2013421131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311243103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2801568 + ... + 2802035.

It is an arithmetic number, because the mean of its divisors is an integer number (127481991).

Almost surely, 2^1311243102 is an apocalyptic number.

1311243102 is an abundant number, since it is smaller than the sum of its proper divisors (1748324682).

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

1311243102 is a wasteful number, since it uses less digits than its factorization.

1311243102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603624 (or 5603621 counting only the distinct ones).

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

The square root of 1311243102 is about 36211.0908700636. The cubic root of 1311243102 is about 1094.5301743738.

Adding to 1311243102 its reverse (2013421131), we get a palindrome (3324664233).

The spelling of 1311243102 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, one hundred two".