71320811 has 4 divisors (see below), whose sum is σ = 71573112. Its totient is φ = 71068512.

The previous prime is 71320783. The next prime is 71320859. The reversal of 71320811 is 11802317.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11802317 = 1283 ⋅9199.

It is a cyclic number.

It is not a de Polignac number, because 71320811 - 2⁶ = 71320747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71320871) 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, 125726 + ... + 126291.

It is an arithmetic number, because the mean of its divisors is an integer number (17893278).

Almost surely, 2^71320811 is an apocalyptic number.

71320811 is a deficient number, since it is larger than the sum of its proper divisors (252301).

71320811 is a wasteful number, since it uses less digits than its factorization.

71320811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252300.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 71320811 is about 8445.1649480635. The cubic root of 71320811 is about 414.7045092542.

The spelling of 71320811 in words is "seventy-one million, three hundred twenty thousand, eight hundred eleven".