71561113 has 32 divisors (see below), whose sum is σ = 83994624. Its totient is φ = 60480000.

The previous prime is 71561107. The next prime is 71561117. The reversal of 71561113 is 31116517.

It is a cyclic number.

It is not a de Polignac number, because 71561113 - 2⁵ = 71561081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71561117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1007868 + ... + 1007938.

It is an arithmetic number, because the mean of its divisors is an integer number (2624832).

Almost surely, 2^71561113 is an apocalyptic number.

It is an amenable number.

71561113 is a deficient number, since it is larger than the sum of its proper divisors (12433511).

71561113 is a wasteful number, since it uses less digits than its factorization.

71561113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its digits is 630, while the sum is 25.

The square root of 71561113 is about 8459.3801782400. The cubic root of 71561113 is about 415.1697433071.

The spelling of 71561113 in words is "seventy-one million, five hundred sixty-one thousand, one hundred thirteen".