1125564843 has 16 divisors (see below), whose sum is σ = 1625768480. Its totient is φ = 692651232.

The previous prime is 1125564829. The next prime is 1125564893. The reversal of 1125564843 is 3484655211.

It is a de Polignac number, because none of the positive numbers 2^k-1125564843 is a prime.

It is a super-2 number, since 2×1125564843² = 2533792431595229298, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125564893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78796 + ... + 91977.

It is an arithmetic number, because the mean of its divisors is an integer number (101610530).

Almost surely, 2^1125564843 is an apocalyptic number.

1125564843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1125564843 is a deficient number, since it is larger than the sum of its proper divisors (500203637).

1125564843 is an equidigital number, since it uses as much as digits as its factorization.

1125564843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170815 (or 170789 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 1125564843 is about 33549.4387881526. The cubic root of 1125564843 is about 1040.2159447416.

The spelling of 1125564843 in words is "one billion, one hundred twenty-five million, five hundred sixty-four thousand, eight hundred forty-three".