1131312440 has 64 divisors (see below), whose sum is σ = 2686068000. Its totient is φ = 427645440.

The previous prime is 1131312437. The next prime is 1131312473. The reversal of 1131312440 is 442131311.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348746 + ... + 351974.

Almost surely, 2^1131312440 is an apocalyptic number.

1131312440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131312440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1343034000).

1131312440 is an abundant number, since it is smaller than the sum of its proper divisors (1554755560).

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

1131312440 is a wasteful number, since it uses less digits than its factorization.

1131312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720 (or 3716 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1131312440 is about 33634.9883306060. The cubic root of 1131312440 is about 1041.9835296166.

Adding to 1131312440 its reverse (442131311), we get a palindrome (1573443751).

The spelling of 1131312440 in words is "one billion, one hundred thirty-one million, three hundred twelve thousand, four hundred forty".