13131537 has 4 divisors (see below), whose sum is σ = 17508720. Its totient is φ = 8754356.

The previous prime is 13131529. The next prime is 13131541. The reversal of 13131537 is 73513131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13131537 - 2³ = 13131529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13131037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188587 + ... + 2188592.

It is an arithmetic number, because the mean of its divisors is an integer number (4377180).

Almost surely, 2^13131537 is an apocalyptic number.

It is an amenable number.

13131537 is a deficient number, since it is larger than the sum of its proper divisors (4377183).

13131537 is an equidigital number, since it uses as much as digits as its factorization.

13131537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4377182.

The product of its digits is 945, while the sum is 24.

The square root of 13131537 is about 3623.7462659519. The cubic root of 13131537 is about 235.9238538692.

Adding to 13131537 its reverse (73513131), we get a palindrome (86644668).

It can be divided in two parts, 1313 and 1537, that added together give a triangular number (2850 = T₇₅).

The spelling of 13131537 in words is "thirteen million, one hundred thirty-one thousand, five hundred thirty-seven".