1311545440 has 24 divisors (see below), whose sum is σ = 3098526480. Its totient is φ = 524618112.

The previous prime is 1311545437. The next prime is 1311545479. The reversal of 1311545440 is 445451131.

It is a junction number, because it is equal to n+sod(n) for n = 1311545399 and 1311545408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4098420 + ... + 4098739.

It is an arithmetic number, because the mean of its divisors is an integer number (129105270).

Almost surely, 2^1311545440 is an apocalyptic number.

1311545440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311545440 is an abundant number, since it is smaller than the sum of its proper divisors (1786981040).

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

1311545440 is an equidigital number, since it uses as much as digits as its factorization.

1311545440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8197174 (or 8197166 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1311545440 is about 36215.2652896538. The cubic root of 1311545440 is about 1094.6142911515.

Adding to 1311545440 its reverse (445451131), we get a palindrome (1756996571).

The spelling of 1311545440 in words is "one billion, three hundred eleven million, five hundred forty-five thousand, four hundred forty".