71718197 has 2 divisors, whose sum is σ = 71718198. Its totient is φ = 71718196.

The previous prime is 71718191. The next prime is 71718233. The reversal of 71718197 is 79181717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58461316 + 13256881 = 7646^2 + 3641^2 .

It is a cyclic number.

It is not a de Polignac number, because 71718197 - 2⁶ = 71718133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71718191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35859098 + 35859099.

It is an arithmetic number, because the mean of its divisors is an integer number (35859099).

Almost surely, 2^71718197 is an apocalyptic number.

It is an amenable number.

71718197 is a deficient number, since it is larger than the sum of its proper divisors (1).

71718197 is an equidigital number, since it uses as much as digits as its factorization.

71718197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 41.

The square root of 71718197 is about 8468.6596932454. The cubic root of 71718197 is about 415.4733013912.

The spelling of 71718197 in words is "seventy-one million, seven hundred eighteen thousand, one hundred ninety-seven".