131645047 has 4 divisors (see below), whose sum is σ = 133311520. Its totient is φ = 129978576.

The previous prime is 131645039. The next prime is 131645051. The reversal of 131645047 is 740546131.

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 131645047 - 2³ = 131645039 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 (131645027) 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, 833118 + ... + 833275.

It is an arithmetic number, because the mean of its divisors is an integer number (33327880).

Almost surely, 2^131645047 is an apocalyptic number.

131645047 is a deficient number, since it is larger than the sum of its proper divisors (1666473).

131645047 is an equidigital number, since it uses as much as digits as its factorization.

131645047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666472.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 131645047 is about 11473.6675479116. The cubic root of 131645047 is about 508.7075398765.

The spelling of 131645047 in words is "one hundred thirty-one million, six hundred forty-five thousand, forty-seven".