1131243140 has 24 divisors (see below), whose sum is σ = 2430859200. Its totient is φ = 441973728.

The previous prime is 1131243119. The next prime is 1131243151. The reversal of 1131243140 is 413421311.

It is a super-2 number, since 2×1131243140² = 2559422083594119200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656840 + ... + 658559.

It is an arithmetic number, because the mean of its divisors is an integer number (101285800).

Almost surely, 2^1131243140 is an apocalyptic number.

1131243140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131243140 is an abundant number, since it is smaller than the sum of its proper divisors (1299616060).

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

1131243140 is a wasteful number, since it uses less digits than its factorization.

1131243140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315451 (or 1315449 counting only the distinct ones).

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

The square root of 1131243140 is about 33633.9581375728. The cubic root of 1131243140 is about 1041.9622531680.

Adding to 1131243140 its reverse (413421311), we get a palindrome (1544664451).

The spelling of 1131243140 in words is "one billion, one hundred thirty-one million, two hundred forty-three thousand, one hundred forty".