71112561 has 16 divisors (see below), whose sum is σ = 103407360. Its totient is φ = 43205760.

The previous prime is 71112541. The next prime is 71112599. The reversal of 71112561 is 16521117.

It is not a de Polignac number, because 71112561 - 2⁹ = 71112049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71112511) 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, 8460 + ... + 14621.

It is an arithmetic number, because the mean of its divisors is an integer number (6462960).

Almost surely, 2^71112561 is an apocalyptic number.

It is an amenable number.

71112561 is a deficient number, since it is larger than the sum of its proper divisors (32294799).

71112561 is a wasteful number, since it uses less digits than its factorization.

71112561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23176.

The product of its digits is 420, while the sum is 24.

The square root of 71112561 is about 8432.8263945133. The cubic root of 71112561 is about 414.3004831551.

Adding to 71112561 its reverse (16521117), we get a palindrome (87633678).

The spelling of 71112561 in words is "seventy-one million, one hundred twelve thousand, five hundred sixty-one".