71185957229 has 2 divisors, whose sum is σ = 71185957230. Its totient is φ = 71185957228.

The previous prime is 71185957189. The next prime is 71185957243. The reversal of 71185957229 is 92275958117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63341312329 + 7844644900 = 251677^2 + 88570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71185957229 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71185957279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35592978614 + 35592978615.

It is an arithmetic number, because the mean of its divisors is an integer number (35592978615).

Almost surely, 2^71185957229 is an apocalyptic number.

It is an amenable number.

71185957229 is a deficient number, since it is larger than the sum of its proper divisors (1).

71185957229 is an equidigital number, since it uses as much as digits as its factorization.

71185957229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 56.

The spelling of 71185957229 in words is "seventy-one billion, one hundred eighty-five million, nine hundred fifty-seven thousand, two hundred twenty-nine".