71317261 has 8 divisors (see below), whose sum is σ = 75613824. Its totient is φ = 67032000.

The previous prime is 71317249. The next prime is 71317289. The reversal of 71317261 is 16271317.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 3-Lehmer number, since φ(71317261) divides (71317261-1)³.

It is a cyclic number.

It is not a de Polignac number, because 71317261 - 2⁷ = 71317133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71317201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12636 + ... + 17386.

It is an arithmetic number, because the mean of its divisors is an integer number (9451728).

Almost surely, 2^71317261 is an apocalyptic number.

It is an amenable number.

71317261 is a deficient number, since it is larger than the sum of its proper divisors (4296563).

71317261 is a wasteful number, since it uses less digits than its factorization.

71317261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651.

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

The square root of 71317261 is about 8444.9547660127. The cubic root of 71317261 is about 414.6976284882.

Adding to 71317261 its reverse (16271317), we get a palindrome (87588578).

The spelling of 71317261 in words is "seventy-one million, three hundred seventeen thousand, two hundred sixty-one".