71440811 has 4 divisors (see below), whose sum is σ = 76936272. Its totient is φ = 65945352.

The previous prime is 71440807. The next prime is 71440813. The reversal of 71440811 is 11804417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11804417 = 79 ⋅149423.

It is a cyclic number.

It is not a de Polignac number, because 71440811 - 2² = 71440807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71440813) 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 3 ways as a sum of consecutive naturals, for example, 2747711 + ... + 2747736.

It is an arithmetic number, because the mean of its divisors is an integer number (19234068).

Almost surely, 2^71440811 is an apocalyptic number.

71440811 is a deficient number, since it is larger than the sum of its proper divisors (5495461).

71440811 is a wasteful number, since it uses less digits than its factorization.

71440811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5495460.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 71440811 is about 8452.2666190792. The cubic root of 71440811 is about 414.9369643456.

The spelling of 71440811 in words is "seventy-one million, four hundred forty thousand, eight hundred eleven".