13231530 has 96 divisors (see below), whose sum is σ = 38054016. Its totient is φ = 3169152.

The previous prime is 13231529. The next prime is 13231531. The reversal of 13231530 is 3513231.

13231530 is a `hidden beast` number, since 132 + 3 + 1 + 530 = 666.

It is an interprime number because it is at equal distance from previous prime (13231529) and next prime (13231531).

It is a super-2 number, since 2×13231530² = 350146772281800, which contains 22 as substring.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13231531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50179 + ... + 50441.

It is an arithmetic number, because the mean of its divisors is an integer number (396396).

Almost surely, 2^13231530 is an apocalyptic number.

13231530 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 13231530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19027008).

13231530 is an abundant number, since it is smaller than the sum of its proper divisors (24822486).

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

13231530 is a wasteful number, since it uses less digits than its factorization.

13231530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 13231530 is about 3637.5170102695. The cubic root of 13231530 is about 236.5211717865.

Adding to 13231530 its reverse (3513231), we get a palindrome (16744761).

The spelling of 13231530 in words is "thirteen million, two hundred thirty-one thousand, five hundred thirty".