13145531 has 4 divisors (see below), whose sum is σ = 15023472. Its totient is φ = 11267592.

The previous prime is 13145527. The next prime is 13145533. The reversal of 13145531 is 13554131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13554131 = 3037 ⋅4463.

It is not a de Polignac number, because 13145531 - 2² = 13145527 is a prime.

It is a super-2 number, since 2×13145531² = 345609970543922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13145497 and 13145506.

It is not an unprimeable number, because it can be changed into a prime (13145533) 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 3 ways as a sum of consecutive naturals, for example, 938960 + ... + 938973.

It is an arithmetic number, because the mean of its divisors is an integer number (3755868).

Almost surely, 2^13145531 is an apocalyptic number.

13145531 is a deficient number, since it is larger than the sum of its proper divisors (1877941).

13145531 is an equidigital number, since it uses as much as digits as its factorization.

13145531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877940.

The product of its digits is 900, while the sum is 23.

The square root of 13145531 is about 3625.6766265071. The cubic root of 13145531 is about 236.0076304629.

Adding to 13145531 its reverse (13554131), we get a palindrome (26699662).

The spelling of 13145531 in words is "thirteen million, one hundred forty-five thousand, five hundred thirty-one".