71931413 has 2 divisors, whose sum is σ = 71931414. Its totient is φ = 71931412.

The previous prime is 71931347. The next prime is 71931427. The reversal of 71931413 is 31413917.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66945124 + 4986289 = 8182^2 + 2233^2 .

It is an emirp because it is prime and its reverse (31413917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71931413 - 2¹⁰ = 71930389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71931463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35965706 + 35965707.

It is an arithmetic number, because the mean of its divisors is an integer number (35965707).

Almost surely, 2^71931413 is an apocalyptic number.

It is an amenable number.

71931413 is a deficient number, since it is larger than the sum of its proper divisors (1).

71931413 is an equidigital number, since it uses as much as digits as its factorization.

71931413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 71931413 is about 8481.2388835594. The cubic root of 71931413 is about 415.8846238377.

The spelling of 71931413 in words is "seventy-one million, nine hundred thirty-one thousand, four hundred thirteen".