1121155647 has 4 divisors (see below), whose sum is σ = 1494874200. Its totient is φ = 747437096.

The previous prime is 1121155613. The next prime is 1121155649. The reversal of 1121155647 is 7465511211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1121155647 - 2¹⁶ = 1121090111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121155649) 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, 186859272 + ... + 186859277.

It is an arithmetic number, because the mean of its divisors is an integer number (373718550).

Almost surely, 2^1121155647 is an apocalyptic number.

1121155647 is a deficient number, since it is larger than the sum of its proper divisors (373718553).

1121155647 is an equidigital number, since it uses as much as digits as its factorization.

1121155647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373718552.

The product of its digits is 8400, while the sum is 33.

The square root of 1121155647 is about 33483.6623892907. The cubic root of 1121155647 is about 1038.8558815322.

Adding to 1121155647 its reverse (7465511211), we get a palindrome (8586666858).

The spelling of 1121155647 in words is "one billion, one hundred twenty-one million, one hundred fifty-five thousand, six hundred forty-seven".