71018197 has 8 divisors (see below), whose sum is σ = 75747096. Its totient is φ = 66350592.

The previous prime is 71018183. The next prime is 71018209. The reversal of 71018197 is 79181017.

It can be written as a sum of positive squares in 4 ways, for example, as 6922161 + 64096036 = 2631^2 + 8006^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71018197 - 2¹¹ = 71016149 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 (71018107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12918 + ... + 17575.

It is an arithmetic number, because the mean of its divisors is an integer number (9468387).

Almost surely, 2^71018197 is an apocalyptic number.

It is an amenable number.

71018197 is a deficient number, since it is larger than the sum of its proper divisors (4728899).

71018197 is a wasteful number, since it uses less digits than its factorization.

71018197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30647.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 71018197 is about 8427.2294972903. The cubic root of 71018197 is about 414.1171477236.

Subtracting 71018197 from its reverse (79181017), we obtain a triangular number (8162820 = T₄₀₄₀).

The spelling of 71018197 in words is "seventy-one million, eighteen thousand, one hundred ninety-seven".