1125631100 has 36 divisors (see below), whose sum is σ = 2664678408. Its totient is φ = 409320000.

The previous prime is 1125631043. The next prime is 1125631121. The reversal of 1125631100 is 11365211.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 510551 + ... + 512750.

Almost surely, 2^1125631100 is an apocalyptic number.

1125631100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1125631100 is an abundant number, since it is smaller than the sum of its proper divisors (1539047308).

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

1125631100 is a wasteful number, since it uses less digits than its factorization.

1125631100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023326 (or 1023319 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1125631100 is about 33550.4262268008. The cubic root of 1125631100 is about 1040.2363553044.

Adding to 1125631100 its reverse (11365211), we get a palindrome (1136996311).

The spelling of 1125631100 in words is "one billion, one hundred twenty-five million, six hundred thirty-one thousand, one hundred".