1231150500 has 144 divisors (see below), whose sum is σ = 3914177904. Its totient is φ = 325747200.

The previous prime is 1231150499. The next prime is 1231150507. The reversal of 1231150500 is 50511321.

1231150500 is a `hidden beast` number, since 12 + 3 + 1 + 150 + 500 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 725440356 + 505710144 = 26934^2 + 22488^2 .

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 (1231150507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 615502 + ... + 617498.

It is an arithmetic number, because the mean of its divisors is an integer number (27181791).

Almost surely, 2^1231150500 is an apocalyptic number.

1231150500 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 1231150500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957088952).

1231150500 is an abundant number, since it is smaller than the sum of its proper divisors (2683027404).

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

1231150500 is a wasteful number, since it uses less digits than its factorization.

1231150500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2144 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1231150500 is about 35087.7542741054. The cubic root of 1231150500 is about 1071.7752287804.

Adding to 1231150500 its reverse (50511321), we get a palindrome (1281661821).

The spelling of 1231150500 in words is "one billion, two hundred thirty-one million, one hundred fifty thousand, five hundred".