1311140550 has 96 divisors (see below), whose sum is σ = 3309859584. Its totient is φ = 343440000.

The previous prime is 1311140513. The next prime is 1311140587. The reversal of 1311140550 is 550411131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1311140513) and next prime (1311140587).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2423280 + ... + 2423820.

It is an arithmetic number, because the mean of its divisors is an integer number (34477704).

Almost surely, 2^1311140550 is an apocalyptic number.

1311140550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311140550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654929792).

1311140550 is an abundant number, since it is smaller than the sum of its proper divisors (1998719034).

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

1311140550 is a wasteful number, since it uses less digits than its factorization.

1311140550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1311140550 is about 36209.6748121272. The cubic root of 1311140550 is about 1094.5016393181.

Adding to 1311140550 its reverse (550411131), we get a palindrome (1861551681).

The spelling of 1311140550 in words is "one billion, three hundred eleven million, one hundred forty thousand, five hundred fifty".