13125531 has 4 divisors (see below), whose sum is σ = 17500712. Its totient is φ = 8750352.

The previous prime is 13125527. The next prime is 13125551. The reversal of 13125531 is 13552131.

13125531 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13125531 - 2² = 13125527 is a prime.

It is a super-2 number, since 2×13125531² = 344559128063922, 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 = 13125498 and 13125507.

It is not an unprimeable number, because it can be changed into a prime (13125551) 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, 2187586 + ... + 2187591.

It is an arithmetic number, because the mean of its divisors is an integer number (4375178).

Almost surely, 2^13125531 is an apocalyptic number.

13125531 is a deficient number, since it is larger than the sum of its proper divisors (4375181).

13125531 is an equidigital number, since it uses as much as digits as its factorization.

13125531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375180.

The product of its digits is 450, while the sum is 21.

The square root of 13125531 is about 3622.9174707686. The cubic root of 13125531 is about 235.8878800466.

Adding to 13125531 its reverse (13552131), we get a palindrome (26677662).

The spelling of 13125531 in words is "thirteen million, one hundred twenty-five thousand, five hundred thirty-one".