71979513 has 16 divisors (see below), whose sum is σ = 103783680. Its totient is φ = 44201216.

The previous prime is 71979491. The next prime is 71979539. The reversal of 71979513 is 31597917.

It is a cyclic number.

It is not a de Polignac number, because 71979513 - 2⁶ = 71979449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71979553) 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, 12618 + ... + 17411.

It is an arithmetic number, because the mean of its divisors is an integer number (6486480).

Almost surely, 2^71979513 is an apocalyptic number.

It is an amenable number.

71979513 is a deficient number, since it is larger than the sum of its proper divisors (31804167).

71979513 is a wasteful number, since it uses less digits than its factorization.

71979513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30096.

The product of its digits is 59535, while the sum is 42.

The square root of 71979513 is about 8484.0740802989. The cubic root of 71979513 is about 415.9773028328.

The spelling of 71979513 in words is "seventy-one million, nine hundred seventy-nine thousand, five hundred thirteen".