123131250 has 144 divisors (see below), whose sum is σ = 365601600. Its totient is φ = 29700000.

The previous prime is 123131249. The next prime is 123131251. The reversal of 123131250 is 52131321.

It is an interprime number because it is at equal distance from previous prime (123131249) and next prime (123131251).

It is a super-2 number, since 2×123131250² = 30322609453125000, which contains 22 as substring.

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 (123131251) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 618651 + ... + 618849.

It is an arithmetic number, because the mean of its divisors is an integer number (2538900).

Almost surely, 2^123131250 is an apocalyptic number.

123131250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123131250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182800800).

123131250 is an abundant number, since it is smaller than the sum of its proper divisors (242470350).

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

123131250 is a wasteful number, since it uses less digits than its factorization.

123131250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 123131250 is about 11096.4521357054. The cubic root of 123131250 is about 497.4958123601.

Adding to 123131250 its reverse (52131321), we get a palindrome (175262571).

The spelling of 123131250 in words is "one hundred twenty-three million, one hundred thirty-one thousand, two hundred fifty".