71224001 has 4 divisors (see below), whose sum is σ = 73149012. Its totient is φ = 69298992.

The previous prime is 71223967. The next prime is 71224009. The reversal of 71224001 is 10042217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10042217 = 2287 ⋅4391.

It can be written as a sum of positive squares in 2 ways, for example, as 40132225 + 31091776 = 6335^2 + 5576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71224001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71224009) 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, 962450 + ... + 962523.

It is an arithmetic number, because the mean of its divisors is an integer number (18287253).

Almost surely, 2^71224001 is an apocalyptic number.

It is an amenable number.

71224001 is a deficient number, since it is larger than the sum of its proper divisors (1925011).

71224001 is a wasteful number, since it uses less digits than its factorization.

71224001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925010.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 71224001 is about 8439.4313197040. The cubic root of 71224001 is about 414.5167860078.

Adding to 71224001 its reverse (10042217), we get a palindrome (81266218).

The spelling of 71224001 in words is "seventy-one million, two hundred twenty-four thousand, one".