131729647 has 4 divisors (see below), whose sum is σ = 150548176. Its totient is φ = 112911120.

The previous prime is 131729627. The next prime is 131729659. The reversal of 131729647 is 746927131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746927131 = 4019 ⋅185849.

It is not a de Polignac number, because 131729647 - 2¹⁹ = 131205359 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 (131729627) 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, 9409254 + ... + 9409267.

It is an arithmetic number, because the mean of its divisors is an integer number (37637044).

Almost surely, 2^131729647 is an apocalyptic number.

131729647 is a deficient number, since it is larger than the sum of its proper divisors (18818529).

131729647 is an equidigital number, since it uses as much as digits as its factorization.

131729647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18818528.

The product of its digits is 63504, while the sum is 40.

The square root of 131729647 is about 11477.3536584005. The cubic root of 131729647 is about 508.8164879992.

The spelling of 131729647 in words is "one hundred thirty-one million, seven hundred twenty-nine thousand, six hundred forty-seven".