65971047 has 4 divisors (see below), whose sum is σ = 87961400. Its totient is φ = 43980696.

The previous prime is 65971013. The next prime is 65971057. The reversal of 65971047 is 74017956.

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

It is not a de Polignac number, because 65971047 - 2¹⁴ = 65954663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65970996 and 65971014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65971057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10995172 + ... + 10995177.

It is an arithmetic number, because the mean of its divisors is an integer number (21990350).

Almost surely, 2^65971047 is an apocalyptic number.

65971047 is a deficient number, since it is larger than the sum of its proper divisors (21990353).

65971047 is a wasteful number, since it uses less digits than its factorization.

65971047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21990352.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 65971047 is about 8122.2562751984. The cubic root of 65971047 is about 404.0648994683.

The spelling of 65971047 in words is "sixty-five million, nine hundred seventy-one thousand, forty-seven".