1121247747 has 48 divisors (see below), whose sum is σ = 1705511808. Its totient is φ = 709188480.

The previous prime is 1121247731. The next prime is 1121247781. The reversal of 1121247747 is 7477421211.

It is a happy number.

It is not a de Polignac number, because 1121247747 - 2⁴ = 1121247731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121247727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2151847 + ... + 2152367.

It is an arithmetic number, because the mean of its divisors is an integer number (35531496).

Almost surely, 2^1121247747 is an apocalyptic number.

1121247747 is a deficient number, since it is larger than the sum of its proper divisors (584264061).

1121247747 is a wasteful number, since it uses less digits than its factorization.

1121247747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 717 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 1121247747 is about 33485.0376586320. The cubic root of 1121247747 is about 1038.8843271832.

Adding to 1121247747 its reverse (7477421211), we get a palindrome (8598668958).

The spelling of 1121247747 in words is "one billion, one hundred twenty-one million, two hundred forty-seven thousand, seven hundred forty-seven".