1231100 has 36 divisors (see below), whose sum is σ = 2880024. Its totient is φ = 454080.

The previous prime is 1231099. The next prime is 1231127. The reversal of 1231100 is 11321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 827 + ... + 1773.

2^1231100 is an apocalyptic number.

1231100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440012).

1231100 is an abundant number, since it is smaller than the sum of its proper divisors (1648924).

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

1231100 is a wasteful number, since it uses less digits than its factorization.

1231100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 967 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1231100 is about 1109.5494581135. The cubic root of 1231100 is about 107.1760574361.

Adding to 1231100 its reverse (11321), we get a palindrome (1242421).

It can be divided in two parts, 1231 and 100, that added together give a palindrome (1331).

The spelling of 1231100 in words is "one million, two hundred thirty-one thousand, one hundred".