71242549569 has 45 divisors (see below), whose sum is σ = 108909171921. Its totient is φ = 46410832440.

The previous prime is 71242549559. The next prime is 71242549583. The reversal of 71242549569 is 96594524217.

It is a happy number.

The square root of 71242549569 is 266913.

It is a perfect power (a square), and thus also a powerful number.

71242549569 is a `hidden beast` number, since 7 + 1 + 2 + 42 + 549 + 56 + 9 = 666.

It is not a de Polignac number, because 71242549569 - 2⁵ = 71242549537 is a prime.

It is a super-2 number, since 2×71242549569² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71242549559) by changing a digit.

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 44 ways as a sum of consecutive naturals, for example, 112903884 + ... + 112904514.

Almost surely, 2^71242549569 is an apocalyptic number.

71242549569 is the 266913-rd square number.

71242549569 is the 133457-th centered octagonal number.

It is an amenable number.

71242549569 is a deficient number, since it is larger than the sum of its proper divisors (37666622352).

71242549569 is an frugal number, since it uses more digits than its factorization.

71242549569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 681 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 71242549569 in words is "seventy-one billion, two hundred forty-two million, five hundred forty-nine thousand, five hundred sixty-nine".