71005601 has 8 divisors (see below), whose sum is σ = 73883880. Its totient is φ = 68156032.

The previous prime is 71005591. The next prime is 71005607. The reversal of 71005601 is 10650017.

It can be written as a sum of positive squares in 4 ways, for example, as 21669025 + 49336576 = 4655^2 + 7024^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-71005601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71005607) 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, 2060 + ... + 12093.

It is an arithmetic number, because the mean of its divisors is an integer number (9235485).

Almost surely, 2^71005601 is an apocalyptic number.

It is an amenable number.

71005601 is a deficient number, since it is larger than the sum of its proper divisors (2878279).

71005601 is a wasteful number, since it uses less digits than its factorization.

71005601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14355.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 71005601 is about 8426.4821248253. The cubic root of 71005601 is about 414.0926632570.

Adding to 71005601 its reverse (10650017), we get a palindrome (81655618).

The spelling of 71005601 in words is "seventy-one million, five thousand, six hundred one".