71915213 has 2 divisors, whose sum is σ = 71915214. Its totient is φ = 71915212.

The previous prime is 71915203. The next prime is 71915231. The reversal of 71915213 is 31251917.

Together with next prime (71915231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67601284 + 4313929 = 8222^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 71915213 - 2⁴ = 71915197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71915203) 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 as a sum of consecutive naturals, namely, 35957606 + 35957607.

It is an arithmetic number, because the mean of its divisors is an integer number (35957607).

Almost surely, 2^71915213 is an apocalyptic number.

It is an amenable number.

71915213 is a deficient number, since it is larger than the sum of its proper divisors (1).

71915213 is an equidigital number, since it uses as much as digits as its factorization.

71915213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 29.

The square root of 71915213 is about 8480.2837806290. The cubic root of 71915213 is about 415.8534004057.

The spelling of 71915213 in words is "seventy-one million, nine hundred fifteen thousand, two hundred thirteen".