71217261 has 12 divisors (see below), whose sum is σ = 106188160. Its totient is φ = 45946440.

The previous prime is 71217259. The next prime is 71217277. The reversal of 71217261 is 16271217.

It is not a de Polignac number, because 71217261 - 2¹ = 71217259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71217281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127351 + ... + 127908.

Almost surely, 2^71217261 is an apocalyptic number.

It is an amenable number.

71217261 is a deficient number, since it is larger than the sum of its proper divisors (34970899).

71217261 is a wasteful number, since it uses less digits than its factorization.

71217261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255296 (or 255293 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 71217261 is about 8439.0319942515. The cubic root of 71217261 is about 414.5037102130.

Adding to 71217261 its reverse (16271217), we get a palindrome (87488478).

The spelling of 71217261 in words is "seventy-one million, two hundred seventeen thousand, two hundred sixty-one".