71673571 has 4 divisors (see below), whose sum is σ = 72537192. Its totient is φ = 70809952.

The previous prime is 71673523. The next prime is 71673583. The reversal of 71673571 is 17537617.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17537617 = 839 ⋅20903.

It is a cyclic number.

It is not a de Polignac number, because 71673571 - 2¹⁹ = 71149283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71673571.

It is not an unprimeable number, because it can be changed into a prime (71673521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431686 + ... + 431851.

It is an arithmetic number, because the mean of its divisors is an integer number (18134298).

Almost surely, 2^71673571 is an apocalyptic number.

71673571 is a deficient number, since it is larger than the sum of its proper divisors (863621).

71673571 is an equidigital number, since it uses as much as digits as its factorization.

71673571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863620.

The product of its digits is 30870, while the sum is 37.

The square root of 71673571 is about 8466.0245097684. The cubic root of 71673571 is about 415.3871086754.

The spelling of 71673571 in words is "seventy-one million, six hundred seventy-three thousand, five hundred seventy-one".