71851771 has 4 divisors (see below), whose sum is σ = 72058000. Its totient is φ = 71645544.

The previous prime is 71851757. The next prime is 71851781. The reversal of 71851771 is 17715817.

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: 17715817 = 7 ⋅2530831.

It is a cyclic number.

It is not a de Polignac number, because 71851771 - 2⁵ = 71851739 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 71851771.

It is not an unprimeable number, because it can be changed into a prime (71851781) 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, 102591 + ... + 103288.

It is an arithmetic number, because the mean of its divisors is an integer number (18014500).

Almost surely, 2^71851771 is an apocalyptic number.

71851771 is a deficient number, since it is larger than the sum of its proper divisors (206229).

71851771 is a wasteful number, since it uses less digits than its factorization.

71851771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206228.

The product of its digits is 13720, while the sum is 37.

The square root of 71851771 is about 8476.5423965199. The cubic root of 71851771 is about 415.7310788914.

The spelling of 71851771 in words is "seventy-one million, eight hundred fifty-one thousand, seven hundred seventy-one".