1121644543 has 4 divisors (see below), whose sum is σ = 1121799600. Its totient is φ = 1121489488.

The previous prime is 1121644523. The next prime is 1121644583. The reversal of 1121644543 is 3454461211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3454461211 = 4919 ⋅702269.

It is a cyclic number.

It is not a de Polignac number, because 1121644543 - 2⁹ = 1121644031 is a prime.

It is a super-3 number, since 3×1121644543³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121644523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66118 + ... + 81331.

It is an arithmetic number, because the mean of its divisors is an integer number (280449900).

Almost surely, 2^1121644543 is an apocalyptic number.

1121644543 is a deficient number, since it is larger than the sum of its proper divisors (155057).

1121644543 is an equidigital number, since it uses as much as digits as its factorization.

1121644543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155056.

The product of its digits is 11520, while the sum is 31.

The square root of 1121644543 is about 33490.9621092019. The cubic root of 1121644543 is about 1039.0068622575.

The spelling of 1121644543 in words is "one billion, one hundred twenty-one million, six hundred forty-four thousand, five hundred forty-three".