1121523220 has 48 divisors (see below), whose sum is σ = 2381315328. Its totient is φ = 443664000.

The previous prime is 1121523209. The next prime is 1121523233. The reversal of 1121523220 is 223251211.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 787429 + ... + 788851.

It is an arithmetic number, because the mean of its divisors is an integer number (49610736).

Almost surely, 2^1121523220 is an apocalyptic number.

1121523220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121523220 is an abundant number, since it is smaller than the sum of its proper divisors (1259792108).

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

1121523220 is a wasteful number, since it uses less digits than its factorization.

1121523220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1121523220 is about 33489.1507805140. The cubic root of 1121523220 is about 1038.9693994161.

Adding to 1121523220 its reverse (223251211), we get a palindrome (1344774431).

The spelling of 1121523220 in words is "one billion, one hundred twenty-one million, five hundred twenty-three thousand, two hundred twenty".