131021500 has 96 divisors (see below), whose sum is σ = 301916160. Its totient is φ = 49608000.

The previous prime is 131021497. The next prime is 131021503. The reversal of 131021500 is 5120131.

It is an interprime number because it is at equal distance from previous prime (131021497) and next prime (131021503).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1224447 + ... + 1224553.

It is an arithmetic number, because the mean of its divisors is an integer number (3144960).

Almost surely, 2^131021500 is an apocalyptic number.

131021500 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 131021500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150958080).

131021500 is an abundant number, since it is smaller than the sum of its proper divisors (170894660).

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

131021500 is a wasteful number, since it uses less digits than its factorization.

131021500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 131021500 is about 11446.4623355865. The cubic root of 131021500 is about 507.9030908204.

Adding to 131021500 its reverse (5120131), we get a palindrome (136141631).

The spelling of 131021500 in words is "one hundred thirty-one million, twenty-one thousand, five hundred".