71156213 has 4 divisors (see below), whose sum is σ = 71786028. Its totient is φ = 70526400.

The previous prime is 71156207. The next prime is 71156219. The reversal of 71156213 is 31265117.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (71156207) and next prime (71156219).

It can be written as a sum of positive squares in 2 ways, for example, as 24671089 + 46485124 = 4967^2 + 6818^2 .

It is a cyclic number.

It is not a de Polignac number, because 71156213 - 2¹⁸ = 70894069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71156219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314738 + ... + 314963.

It is an arithmetic number, because the mean of its divisors is an integer number (17946507).

Almost surely, 2^71156213 is an apocalyptic number.

It is an amenable number.

71156213 is a deficient number, since it is larger than the sum of its proper divisors (629815).

71156213 is a wasteful number, since it uses less digits than its factorization.

71156213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629814.

The product of its digits is 1260, while the sum is 26.

The square root of 71156213 is about 8435.4142162670. The cubic root of 71156213 is about 414.3852377340.

The spelling of 71156213 in words is "seventy-one million, one hundred fifty-six thousand, two hundred thirteen".