131791247 has 4 divisors (see below), whose sum is σ = 150618576. Its totient is φ = 112963920.

The previous prime is 131791241. The next prime is 131791249. The reversal of 131791247 is 742197131.

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

It is a cyclic number.

It is not a de Polignac number, because 131791247 - 2⁸ = 131790991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131791241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9413654 + ... + 9413667.

It is an arithmetic number, because the mean of its divisors is an integer number (37654644).

Almost surely, 2^131791247 is an apocalyptic number.

131791247 is a deficient number, since it is larger than the sum of its proper divisors (18827329).

131791247 is an equidigital number, since it uses as much as digits as its factorization.

131791247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18827328.

The product of its digits is 10584, while the sum is 35.

The square root of 131791247 is about 11480.0368901846. The cubic root of 131791247 is about 508.8957873117.

The spelling of 131791247 in words is "one hundred thirty-one million, seven hundred ninety-one thousand, two hundred forty-seven".