1121120172 has 18 divisors (see below), whose sum is σ = 2833942748. Its totient is φ = 373706712.

The previous prime is 1121120171. The next prime is 1121120219. The reversal of 1121120172 is 2710211211.

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 (18).

It is not an unprimeable number, because it can be changed into a prime (1121120171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15571078 + ... + 15571149.

Almost surely, 2^1121120172 is an apocalyptic number.

1121120172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1121120172 is an abundant number, since it is smaller than the sum of its proper divisors (1712822576).

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

1121120172 is a wasteful number, since it uses less digits than its factorization.

1121120172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31142237 (or 31142232 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 1121120172 is about 33483.1326491414. The cubic root of 1121120172 is about 1038.8449244448.

Adding to 1121120172 its reverse (2710211211), we get a palindrome (3831331383).

The spelling of 1121120172 in words is "one billion, one hundred twenty-one million, one hundred twenty thousand, one hundred seventy-two".