71544997 has 4 divisors (see below), whose sum is σ = 71581900. Its totient is φ = 71508096.

The previous prime is 71544989. The next prime is 71545003. The reversal of 71544997 is 79944517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79944517 = 89 ⋅898253.

It can be written as a sum of positive squares in 2 ways, for example, as 15729156 + 55815841 = 3966^2 + 7471^2 .

It is a cyclic number.

It is not a de Polignac number, because 71544997 - 2³ = 71544989 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 (71544097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15372 + ... + 19477.

It is an arithmetic number, because the mean of its divisors is an integer number (17895475).

Almost surely, 2^71544997 is an apocalyptic number.

It is an amenable number.

71544997 is a deficient number, since it is larger than the sum of its proper divisors (36903).

71544997 is a wasteful number, since it uses less digits than its factorization.

71544997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36902.

The product of its digits is 317520, while the sum is 46.

The square root of 71544997 is about 8458.4275725456. The cubic root of 71544997 is about 415.1385747127.

The spelling of 71544997 in words is "seventy-one million, five hundred forty-four thousand, nine hundred ninety-seven".