71399613 has 16 divisors (see below), whose sum is σ = 99904896. Its totient is φ = 45270720.

The previous prime is 71399597. The next prime is 71399623. The reversal of 71399613 is 31699317.

It is not a de Polignac number, because 71399613 - 2⁴ = 71399597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71399623) 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 15 ways as a sum of consecutive naturals, for example, 9631 + ... + 15347.

It is an arithmetic number, because the mean of its divisors is an integer number (6244056).

Almost surely, 2^71399613 is an apocalyptic number.

It is an amenable number.

71399613 is a deficient number, since it is larger than the sum of its proper divisors (28505283).

71399613 is a wasteful number, since it uses less digits than its factorization.

71399613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5924.

The product of its digits is 30618, while the sum is 39.

The square root of 71399613 is about 8449.8291698708. The cubic root of 71399613 is about 414.8571880018.

The spelling of 71399613 in words is "seventy-one million, three hundred ninety-nine thousand, six hundred thirteen".