71217061 has 2 divisors, whose sum is σ = 71217062. Its totient is φ = 71217060.

The previous prime is 71217037. The next prime is 71217077. The reversal of 71217061 is 16071217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63202500 + 8014561 = 7950^2 + 2831^2 .

It is an emirp because it is prime and its reverse (16071217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71217061 - 2⁷ = 71216933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71217031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35608530 + 35608531.

It is an arithmetic number, because the mean of its divisors is an integer number (35608531).

Almost surely, 2^71217061 is an apocalyptic number.

It is an amenable number.

71217061 is a deficient number, since it is larger than the sum of its proper divisors (1).

71217061 is an equidigital number, since it uses as much as digits as its factorization.

71217061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 71217061 is about 8439.0201445428. The cubic root of 71217061 is about 414.5033221946.

Adding to 71217061 its reverse (16071217), we get a palindrome (87288278).

The spelling of 71217061 in words is "seventy-one million, two hundred seventeen thousand, sixty-one".