1121247756 has 18 divisors (see below), whose sum is σ = 2834265252. Its totient is φ = 373749240.

The previous prime is 1121247731. The next prime is 1121247781. The reversal of 1121247756 is 6577421211.

It is an interprime number because it is at equal distance from previous prime (1121247731) and next prime (1121247781).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 31145771 = 1121247756 / (1 + 1 + 2 + 1 + 2 + 4 + 7 + 7 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 1121247756.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15572850 + ... + 15572921.

Almost surely, 2^1121247756 is an apocalyptic number.

It is an amenable number.

1121247756 is an abundant number, since it is smaller than the sum of its proper divisors (1713017496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121247756 is a wasteful number, since it uses less digits than its factorization.

1121247756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31145781 (or 31145776 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 1121247756 is about 33485.0377930203. The cubic root of 1121247756 is about 1038.8843299628.

Adding to 1121247756 its reverse (6577421211), we get a palindrome (7698668967).

The spelling of 1121247756 in words is "one billion, one hundred twenty-one million, two hundred forty-seven thousand, seven hundred fifty-six".