71190081 has 6 divisors (see below), whose sum is σ = 102830130. Its totient is φ = 47460048.

The previous prime is 71190079. The next prime is 71190103. The reversal of 71190081 is 18009117.

It can be written as a sum of positive squares in only one way, i.e., 64641600 + 6548481 = 8040^2 + 2559^2 .

It is not a de Polignac number, because 71190081 - 2¹ = 71190079 is a prime.

It is a super-2 number, since 2×71190081² = 10136055265573122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71190071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3954996 + ... + 3955013.

It is an arithmetic number, because the mean of its divisors is an integer number (17138355).

Almost surely, 2^71190081 is an apocalyptic number.

It is an amenable number.

71190081 is a deficient number, since it is larger than the sum of its proper divisors (31640049).

71190081 is a wasteful number, since it uses less digits than its factorization.

71190081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7910015 (or 7910012 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 71190081 is about 8437.4214663012. The cubic root of 71190081 is about 414.4509718542.

Adding to 71190081 its reverse (18009117), we get a palindrome (89199198).

The spelling of 71190081 in words is "seventy-one million, one hundred ninety thousand, eighty-one".