71281801 has 4 divisors (see below), whose sum is σ = 71443152. Its totient is φ = 71120452.

The previous prime is 71281789. The next prime is 71281817. The reversal of 71281801 is 10818217.

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: 10818217 = 89 ⋅121553.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71281801 is a prime.

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 71281801.

It is not an unprimeable number, because it can be changed into a prime (71281891) 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, 80011 + ... + 80896.

It is an arithmetic number, because the mean of its divisors is an integer number (17860788).

Almost surely, 2^71281801 is an apocalyptic number.

It is an amenable number.

71281801 is a deficient number, since it is larger than the sum of its proper divisors (161351).

71281801 is a wasteful number, since it uses less digits than its factorization.

71281801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161350.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 71281801 is about 8442.8550265891. The cubic root of 71281801 is about 414.6288858230.

The spelling of 71281801 in words is "seventy-one million, two hundred eighty-one thousand, eight hundred one".