13081500 has 240 divisors, whose sum is σ = 47567520. Its totient is φ = 3110400.

The previous prime is 13081493. The next prime is 13081507. The reversal of 13081500 is 518031.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13081493) and next prime (13081507).

It is a super-2 number, since 2×13081500² = 342251284500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13081507) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 688491 + ... + 688509.

It is an arithmetic number, because the mean of its divisors is an integer number (198198).

Almost surely, 2^13081500 is an apocalyptic number.

13081500 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 13081500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23783760).

13081500 is an abundant number, since it is smaller than the sum of its proper divisors (34486020).

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

13081500 is a wasteful number, since it uses less digits than its factorization.

13081500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 13081500 is about 3616.8356335338. The cubic root of 13081500 is about 235.6238141582.

Adding to 13081500 its reverse (518031), we get a palindrome (13599531).

The spelling of 13081500 in words is "thirteen million, eighty-one thousand, five hundred".