1131540 has 24 divisors (see below), whose sum is σ = 3168480. Its totient is φ = 301728.

The previous prime is 1131523. The next prime is 1131547. The reversal of 1131540 is 451311.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9370 + ... + 9489.

It is an arithmetic number, because the mean of its divisors is an integer number (132020).

2^1131540 is an apocalyptic number.

1131540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131540 is an abundant number, since it is smaller than the sum of its proper divisors (2036940).

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

1131540 is a wasteful number, since it uses less digits than its factorization.

1131540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18871 (or 18869 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1131540 is about 1063.7386897166. The cubic root of 1131540 is about 104.2053388855.

Adding to 1131540 its reverse (451311), we get a palindrome (1582851).

It can be divided in two parts, 113 and 1540, that added together give a triangular number (1653 = T₅₇).

The spelling of 1131540 in words is "one million, one hundred thirty-one thousand, five hundred forty".