71215997101 has 2 divisors, whose sum is σ = 71215997102. Its totient is φ = 71215997100.

The previous prime is 71215997057. The next prime is 71215997179. The reversal of 71215997101 is 10179951217.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70358093001 + 857904100 = 265251^2 + 29290^2 .

It is a cyclic number.

It is not a de Polignac number, because 71215997101 - 2⁹ = 71215996589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71215997191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35607998550 + 35607998551.

It is an arithmetic number, because the mean of its divisors is an integer number (35607998551).

Almost surely, 2^71215997101 is an apocalyptic number.

It is an amenable number.

71215997101 is a deficient number, since it is larger than the sum of its proper divisors (1).

71215997101 is an equidigital number, since it uses as much as digits as its factorization.

71215997101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 43.

The spelling of 71215997101 in words is "seventy-one billion, two hundred fifteen million, nine hundred ninety-seven thousand, one hundred one".