71288281 has 4 divisors (see below), whose sum is σ = 72946192. Its totient is φ = 69630372.

The previous prime is 71288263. The next prime is 71288311. The reversal of 71288281 is 18288217.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18288217 = 47 ⋅389111.

It is a cyclic number.

It is not a de Polignac number, because 71288281 - 2⁷ = 71288153 is a prime.

It is a super-2 number, since 2×71288281² = 10164038015869922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71288281.

It is not an unprimeable number, because it can be changed into a prime (71288081) 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, 828891 + ... + 828976.

It is an arithmetic number, because the mean of its divisors is an integer number (18236548).

Almost surely, 2^71288281 is an apocalyptic number.

It is an amenable number.

71288281 is a deficient number, since it is larger than the sum of its proper divisors (1657911).

71288281 is a wasteful number, since it uses less digits than its factorization.

71288281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657910.

The product of its digits is 14336, while the sum is 37.

The square root of 71288281 is about 8443.2387743093. The cubic root of 71288281 is about 414.6414496365.

The spelling of 71288281 in words is "seventy-one million, two hundred eighty-eight thousand, two hundred eighty-one".