1311240144 has 40 divisors (see below), whose sum is σ = 3391657920. Its totient is φ = 436526848.

The previous prime is 1311240127. The next prime is 1311240157. The reversal of 1311240144 is 4410421131.

It is a self number, because there is not a number n which added to its sum of digits gives 1311240144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21949 + ... + 55715.

It is an arithmetic number, because the mean of its divisors is an integer number (84791448).

Almost surely, 2^1311240144 is an apocalyptic number.

It is an amenable number.

1311240144 is an abundant number, since it is smaller than the sum of its proper divisors (2080417776).

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

1311240144 is a wasteful number, since it uses less digits than its factorization.

1311240144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34587 (or 34581 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1311240144 is about 36211.0500262006. The cubic root of 1311240144 is about 1094.5293513322.

Adding to 1311240144 its reverse (4410421131), we get a palindrome (5721661275).

The spelling of 1311240144 in words is "one billion, three hundred eleven million, two hundred forty thousand, one hundred forty-four".