71723161 has 4 divisors (see below), whose sum is σ = 71740800. Its totient is φ = 71705524.

The previous prime is 71723159. The next prime is 71723167. The reversal of 71723161 is 16132717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71723161 - 2¹ = 71723159 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (71723167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720 + ... + 11998.

It is an arithmetic number, because the mean of its divisors is an integer number (17935200).

Almost surely, 2^71723161 is an apocalyptic number.

It is an amenable number.

71723161 is a deficient number, since it is larger than the sum of its proper divisors (17639).

71723161 is a wasteful number, since it uses less digits than its factorization.

71723161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17638.

The product of its digits is 1764, while the sum is 28.

The square root of 71723161 is about 8468.9527687902. The cubic root of 71723161 is about 415.4828868798.

Adding to 71723161 its reverse (16132717), we get a palindrome (87855878).

The spelling of 71723161 in words is "seventy-one million, seven hundred twenty-three thousand, one hundred sixty-one".