131318641 has 4 divisors (see below), whose sum is σ = 135846900. Its totient is φ = 126790384.

The previous prime is 131318609. The next prime is 131318647. The reversal of 131318641 is 146813131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 53949025 + 77369616 = 7345^2 + 8796^2 .

It is a cyclic number.

It is not a de Polignac number, because 131318641 - 2⁵ = 131318609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131318647) 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, 2264086 + ... + 2264143.

It is an arithmetic number, because the mean of its divisors is an integer number (33961725).

Almost surely, 2^131318641 is an apocalyptic number.

It is an amenable number.

131318641 is a deficient number, since it is larger than the sum of its proper divisors (4528259).

131318641 is an equidigital number, since it uses as much as digits as its factorization.

131318641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528258.

The product of its digits is 1728, while the sum is 28.

The square root of 131318641 is about 11459.4345846556. The cubic root of 131318641 is about 508.2867553010.

The spelling of 131318641 in words is "one hundred thirty-one million, three hundred eighteen thousand, six hundred forty-one".