1121536643 has 8 divisors (see below), whose sum is σ = 1132705200. Its totient is φ = 1110384288.

The previous prime is 1121536627. The next prime is 1121536679. The reversal of 1121536643 is 3466351211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1121536643 - 2⁴ = 1121536627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121536243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172628 + ... + 179006.

It is an arithmetic number, because the mean of its divisors is an integer number (141588150).

Almost surely, 2^1121536643 is an apocalyptic number.

1121536643 is a deficient number, since it is larger than the sum of its proper divisors (11168557).

1121536643 is a wasteful number, since it uses less digits than its factorization.

1121536643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8101.

The product of its digits is 12960, while the sum is 32.

The square root of 1121536643 is about 33489.3511881016. The cubic root of 1121536643 is about 1038.9735443832.

Adding to 1121536643 its reverse (3466351211), we get a palindrome (4587887854).

The spelling of 1121536643 in words is "one billion, one hundred twenty-one million, five hundred thirty-six thousand, six hundred forty-three".