1121628500 has 24 divisors (see below), whose sum is σ = 2449637736. Its totient is φ = 448651200.

The previous prime is 1121628493. The next prime is 1121628509. The reversal of 1121628500 is 58261211.

It can be written as a sum of positive squares in 4 ways, for example, as 84015556 + 1037612944 = 9166^2 + 32212^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1121628500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121628509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121129 + ... + 1122128.

It is an arithmetic number, because the mean of its divisors is an integer number (102068239).

Almost surely, 2^1121628500 is an apocalyptic number.

1121628500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121628500 is an abundant number, since it is smaller than the sum of its proper divisors (1328009236).

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

1121628500 is a wasteful number, since it uses less digits than its factorization.

1121628500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243276 (or 2243264 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 1121628500 is about 33490.7225959668. The cubic root of 1121628500 is about 1039.0019085590.

Adding to 1121628500 its reverse (58261211), we get a palindrome (1179889711).

The spelling of 1121628500 in words is "one billion, one hundred twenty-one million, six hundred twenty-eight thousand, five hundred".