1311241426440 has 64 divisors (see below), whose sum is σ = 4291335581760. Its totient is φ = 317876709120.

The previous prime is 1311241426409. The next prime is 1311241426441. The reversal of 1311241426440 is 446241421131.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1311241426441) 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, 496681039 + ... + 496683678.

It is an arithmetic number, because the mean of its divisors is an integer number (67052118465).

Almost surely, 2^{1311241426440} is an apocalyptic number.

1311241426440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311241426440 is an abundant number, since it is smaller than the sum of its proper divisors (2980094155320).

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

1311241426440 is a wasteful number, since it uses less digits than its factorization.

1311241426440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993364742 (or 993364738 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

Adding to 1311241426440 its reverse (446241421131), we get a palindrome (1757482847571).

The spelling of 1311241426440 in words is "one trillion, three hundred eleven billion, two hundred forty-one million, four hundred twenty-six thousand, four hundred forty".