13137181 has 4 divisors (see below), whose sum is σ = 13225500. Its totient is φ = 13048864.

The previous prime is 13137169. The next prime is 13137193. The reversal of 13137181 is 18173131.

13137181 is digitally balanced in base 2, because in such base 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 an interprime number because it is at equal distance from previous prime (13137169) and next prime (13137193).

It can be written as a sum of positive squares in 2 ways, for example, as 3865156 + 9272025 = 1966^2 + 3045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13137181 is a prime.

It is a super-2 number, since 2×13137181² = 345171049253522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13137121) 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, 43936 + ... + 44233.

It is an arithmetic number, because the mean of its divisors is an integer number (3306375).

Almost surely, 2^13137181 is an apocalyptic number.

It is an amenable number.

13137181 is a deficient number, since it is larger than the sum of its proper divisors (88319).

13137181 is an equidigital number, since it uses as much as digits as its factorization.

13137181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88318.

The product of its digits is 504, while the sum is 25.

The square root of 13137181 is about 3624.5249343880. The cubic root of 13137181 is about 235.9576494436.

It can be divided in two parts, 1313 and 7181, that multiplied together give a triangular number (9428653 = T₄₃₄₂).

The spelling of 13137181 in words is "thirteen million, one hundred thirty-seven thousand, one hundred eighty-one".