71957213 has 2 divisors, whose sum is σ = 71957214. Its totient is φ = 71957212.

The previous prime is 71957203. The next prime is 71957227. The reversal of 71957213 is 31275917.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47087044 + 24870169 = 6862^2 + 4987^2 .

It is a cyclic number.

It is not a de Polignac number, because 71957213 - 2¹² = 71953117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71957203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35978606 + 35978607.

It is an arithmetic number, because the mean of its divisors is an integer number (35978607).

Almost surely, 2^71957213 is an apocalyptic number.

It is an amenable number.

71957213 is a deficient number, since it is larger than the sum of its proper divisors (1).

71957213 is an equidigital number, since it uses as much as digits as its factorization.

71957213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 35.

The square root of 71957213 is about 8482.7597514017. The cubic root of 71957213 is about 415.9343403675.

The spelling of 71957213 in words is "seventy-one million, nine hundred fifty-seven thousand, two hundred thirteen".