71089281 has 6 divisors (see below), whose sum is σ = 102684530. Its totient is φ = 47392848.

The previous prime is 71089259. The next prime is 71089283. The reversal of 71089281 is 18298017.

It can be written as a sum of positive squares in only one way, i.e., 58064400 + 13024881 = 7620^2 + 3609^2 .

It is not a de Polignac number, because 71089281 - 2¹³ = 71081089 is a prime.

It is a super-2 number, since 2×71089281² = 10107371746193922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71089283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3949396 + ... + 3949413.

Almost surely, 2^71089281 is an apocalyptic number.

It is an amenable number.

71089281 is a deficient number, since it is larger than the sum of its proper divisors (31595249).

71089281 is a wasteful number, since it uses less digits than its factorization.

71089281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7898815 (or 7898812 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 71089281 is about 8431.4459613995. The cubic root of 71089281 is about 414.2552686023.

The spelling of 71089281 in words is "seventy-one million, eighty-nine thousand, two hundred eighty-one".