13131501 has 4 divisors (see below), whose sum is σ = 17508672. Its totient is φ = 8754332.

The previous prime is 13131499. The next prime is 13131509. The reversal of 13131501 is 10513131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10513131 = 3 ⋅3504377.

It is a cyclic number.

It is not a de Polignac number, because 13131501 - 2¹ = 13131499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131509) 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, 2188581 + ... + 2188586.

It is an arithmetic number, because the mean of its divisors is an integer number (4377168).

Almost surely, 2^13131501 is an apocalyptic number.

It is an amenable number.

13131501 is a deficient number, since it is larger than the sum of its proper divisors (4377171).

13131501 is an equidigital number, since it uses as much as digits as its factorization.

13131501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377170.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 13131501 is about 3623.7412987133. The cubic root of 13131501 is about 235.9236382745.

Adding to 13131501 its reverse (10513131), we get a palindrome (23644632).

The spelling of 13131501 in words is "thirteen million, one hundred thirty-one thousand, five hundred one".