71540661 has 16 divisors (see below), whose sum is σ = 96615104. Its totient is φ = 47084544.

The previous prime is 71540611. The next prime is 71540669. The reversal of 71540661 is 16604517.

It is not a de Polignac number, because 71540661 - 2¹⁹ = 71016373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71540669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90510 + ... + 91296.

It is an arithmetic number, because the mean of its divisors is an integer number (6038444).

Almost surely, 2^71540661 is an apocalyptic number.

It is an amenable number.

71540661 is a deficient number, since it is larger than the sum of its proper divisors (25074443).

71540661 is a wasteful number, since it uses less digits than its factorization.

71540661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 71540661 is about 8458.1712562468. The cubic root of 71540661 is about 415.1301880222.

The spelling of 71540661 in words is "seventy-one million, five hundred forty thousand, six hundred sixty-one".