71143805 has 4 divisors (see below), whose sum is σ = 85372572. Its totient is φ = 56915040.

The previous prime is 71143781. The next prime is 71143811. The reversal of 71143805 is 50834117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50834117 = 23 ⋅2210179.

It can be written as a sum of positive squares in 2 ways, for example, as 26481316 + 44662489 = 5146^2 + 6683^2 .

It is not a de Polignac number, because 71143805 - 2¹⁴ = 71127421 is a prime.

It is a super-2 number, since 2×71143805² = 10122881979756050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7114376 + ... + 7114385.

It is an arithmetic number, because the mean of its divisors is an integer number (21343143).

Almost surely, 2^71143805 is an apocalyptic number.

It is an amenable number.

71143805 is a deficient number, since it is larger than the sum of its proper divisors (14228767).

71143805 is a wasteful number, since it uses less digits than its factorization.

71143805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14228766.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 71143805 is about 8434.6787135018. The cubic root of 71143805 is about 414.3611499291.

The spelling of 71143805 in words is "seventy-one million, one hundred forty-three thousand, eight hundred five".