131500000 has 84 divisors (see below), whose sum is σ = 324839592. Its totient is φ = 52400000.

The previous prime is 131499983. The next prime is 131500009. The reversal of 131500000 is 5131.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 131500000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131500009) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 499869 + ... + 500131.

It is an arithmetic number, because the mean of its divisors is an integer number (3867138).

Almost surely, 2^131500000 is an apocalyptic number.

131500000 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 131500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162419796).

131500000 is an abundant number, since it is smaller than the sum of its proper divisors (193339592).

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

131500000 is an frugal number, since it uses more digits than its factorization.

131500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 15, while the sum is 10.

The square root of 131500000 is about 11467.3449411797. The cubic root of 131500000 is about 508.5206392671.

Adding to 131500000 its reverse (5131), we get a palindrome (131505131).

The spelling of 131500000 in words is "one hundred thirty-one million, five hundred thousand".