71172481 has 4 divisors (see below), whose sum is σ = 72515412. Its totient is φ = 69829552.

The previous prime is 71172463. The next prime is 71172509. The reversal of 71172481 is 18427117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18427117 = 23 ⋅801179.

It can be written as a sum of positive squares in 2 ways, for example, as 42185025 + 28987456 = 6495^2 + 5384^2 .

It is a cyclic number.

It is not a de Polignac number, because 71172481 - 2¹⁷ = 71041409 is a prime.

It is a super-2 number, since 2×71172481² = 10131044103390722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71170481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671386 + ... + 671491.

It is an arithmetic number, because the mean of its divisors is an integer number (18128853).

Almost surely, 2^71172481 is an apocalyptic number.

It is an amenable number.

71172481 is a deficient number, since it is larger than the sum of its proper divisors (1342931).

71172481 is a wasteful number, since it uses less digits than its factorization.

71172481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342930.

The product of its digits is 3136, while the sum is 31.

The square root of 71172481 is about 8436.3784291602. The cubic root of 71172481 is about 414.4168147628.

Adding to 71172481 its reverse (18427117), we get a palindrome (89599598).

The spelling of 71172481 in words is "seventy-one million, one hundred seventy-two thousand, four hundred eighty-one".