13500145231 has 4 divisors (see below), whose sum is σ = 13580984592. Its totient is φ = 13419305872.

The previous prime is 13500145181. The next prime is 13500145237. The reversal of 13500145231 is 13254100531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13500145231 - 2¹³ = 13500137039 is a prime.

It is a super-2 number, since 2×13500145231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13500145196 and 13500145205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13500145237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40419430 + ... + 40419763.

It is an arithmetic number, because the mean of its divisors is an integer number (3395246148).

Almost surely, 2^13500145231 is an apocalyptic number.

13500145231 is a deficient number, since it is larger than the sum of its proper divisors (80839361).

13500145231 is an equidigital number, since it uses as much as digits as its factorization.

13500145231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80839360.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 13500145231 its reverse (13254100531), we get a palindrome (26754245762).

The spelling of 13500145231 in words is "thirteen billion, five hundred million, one hundred forty-five thousand, two hundred thirty-one".