71860513 has 4 divisors (see below), whose sum is σ = 76087620. Its totient is φ = 67633408.

The previous prime is 71860507. The next prime is 71860517. The reversal of 71860513 is 31506817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31506817 = 67 ⋅470251.

It can be written as a sum of positive squares in 2 ways, for example, as 59243809 + 12616704 = 7697^2 + 3552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71860513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71860517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2113528 + ... + 2113561.

It is an arithmetic number, because the mean of its divisors is an integer number (19021905).

Almost surely, 2^71860513 is an apocalyptic number.

It is an amenable number.

71860513 is a deficient number, since it is larger than the sum of its proper divisors (4227107).

71860513 is a wasteful number, since it uses less digits than its factorization.

71860513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4227106.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 71860513 is about 8477.0580392020. The cubic root of 71860513 is about 415.7479384791.

The spelling of 71860513 in words is "seventy-one million, eight hundred sixty thousand, five hundred thirteen".