1121201280 has 96 divisors (see below), whose sum is σ = 3871668060. Its totient is φ = 298985472.

The previous prime is 1121201251. The next prime is 1121201281. The reversal of 1121201280 is 821021211.

It can be written as a sum of positive squares in 2 ways, for example, as 1076364864 + 44836416 = 32808^2 + 6696^2 .

It is a tau number, because it is divible by the number of its divisors (96).

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 (1121201281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91567 + ... + 103086.

Almost surely, 2^1121201280 is an apocalyptic number.

1121201280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121201280 is an abundant number, since it is smaller than the sum of its proper divisors (2750466780).

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

1121201280 is a wasteful number, since it uses less digits than its factorization.

1121201280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194678 (or 194663 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 1121201280 is about 33484.3438042319. The cubic root of 1121201280 is about 1038.8699757594.

Adding to 1121201280 its reverse (821021211), we get a palindrome (1942222491).

It can be divided in two parts, 1121201 and 280, that added together give a square (1121481 = 1059²).

The spelling of 1121201280 in words is "one billion, one hundred twenty-one million, two hundred one thousand, two hundred eighty".