71540165 has 16 divisors (see below), whose sum is σ = 91112688. Its totient is φ = 53738496.

The previous prime is 71540159. The next prime is 71540179. The reversal of 71540165 is 56104517.

It can be written as a sum of positive squares in 8 ways, for example, as 188356 + 71351809 = 434^2 + 8447^2 .

It is not a de Polignac number, because 71540165 - 2¹⁰ = 71539141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51419 + ... + 52791.

It is an arithmetic number, because the mean of its divisors is an integer number (5694543).

Almost surely, 2^71540165 is an apocalyptic number.

It is an amenable number.

71540165 is a deficient number, since it is larger than the sum of its proper divisors (19572523).

71540165 is a wasteful number, since it uses less digits than its factorization.

71540165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 71540165 is about 8458.1419354371. The cubic root of 71540165 is about 415.1292286375.

The spelling of 71540165 in words is "seventy-one million, five hundred forty thousand, one hundred sixty-five".