1131243020 has 24 divisors (see below), whose sum is σ = 2457529200. Its totient is φ = 436893632.

The previous prime is 1131242989. The next prime is 1131243023. The reversal of 1131243020 is 203421311.

It is a self number, because there is not a number n which added to its sum of digits gives 1131243020.

It is not an unprimeable number, because it can be changed into a prime (1131243023) 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, 974630 + ... + 975789.

It is an arithmetic number, because the mean of its divisors is an integer number (102397050).

Almost surely, 2^1131243020 is an apocalyptic number.

1131243020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131243020 is an abundant number, since it is smaller than the sum of its proper divisors (1326286180).

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

1131243020 is a wasteful number, since it uses less digits than its factorization.

1131243020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950457 (or 1950455 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1131243020 is about 33633.9563536614. The cubic root of 1131243020 is about 1041.9622163249.

Adding to 1131243020 its reverse (203421311), we get a palindrome (1334664331).

The spelling of 1131243020 in words is "one billion, one hundred thirty-one million, two hundred forty-three thousand, twenty".