71000018 has 4 divisors (see below), whose sum is σ = 106500030. Its totient is φ = 35500008.

The previous prime is 70999997. The next prime is 71000051. The reversal of 71000018 is 81000017.

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

It can be written as a sum of positive squares in only one way, i.e., 42941809 + 28058209 = 6553^2 + 5297^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17750003 + ... + 17750006.

Almost surely, 2^71000018 is an apocalyptic number.

71000018 is a deficient number, since it is larger than the sum of its proper divisors (35500012).

71000018 is a wasteful number, since it uses less digits than its factorization.

71000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35500011.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 71000018 is about 8426.1508412798. The cubic root of 71000018 is about 414.0818099351.

Subtracting 71000018 from its reverse (81000017), we obtain a palindrome (9999999).

The spelling of 71000018 in words is "seventy-one million, eighteen", and thus it is an aban number and an uban number.