71017145 has 4 divisors (see below), whose sum is σ = 85220580. Its totient is φ = 56813712.

The previous prime is 71017099. The next prime is 71017147. The reversal of 71017145 is 54171017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8543929 + 62473216 = 2923^2 + 7904^2 .

It is a cyclic number.

It is not a de Polignac number, because 71017145 - 2⁶ = 71017081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71017147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7101710 + ... + 7101719.

It is an arithmetic number, because the mean of its divisors is an integer number (21305145).

Almost surely, 2^71017145 is an apocalyptic number.

It is an amenable number.

71017145 is a deficient number, since it is larger than the sum of its proper divisors (14203435).

71017145 is a wasteful number, since it uses less digits than its factorization.

71017145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14203434.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 71017145 is about 8427.1670803420. The cubic root of 71017145 is about 414.1151029266.

The spelling of 71017145 in words is "seventy-one million, seventeen thousand, one hundred forty-five".