71851005 has 24 divisors (see below), whose sum is σ = 125202168. Its totient is φ = 38117376.

The previous prime is 71850997. The next prime is 71851007. The reversal of 71851005 is 50015817.

It can be written as a sum of positive squares in 4 ways, for example, as 7257636 + 64593369 = 2694^2 + 8037^2 .

It is not a de Polignac number, because 71851005 - 2³ = 71850997 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71851005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71851007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4549 + ... + 12821.

It is an arithmetic number, because the mean of its divisors is an integer number (5216757).

Almost surely, 2^71851005 is an apocalyptic number.

It is an amenable number.

71851005 is a deficient number, since it is larger than the sum of its proper divisors (53351163).

71851005 is a wasteful number, since it uses less digits than its factorization.

71851005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8477 (or 8474 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 71851005 is about 8476.4972128822. The cubic root of 71851005 is about 415.7296015391.

The spelling of 71851005 in words is "seventy-one million, eight hundred fifty-one thousand, five".