71216401 has 2 divisors, whose sum is σ = 71216402. Its totient is φ = 71216400.

The previous prime is 71216399. The next prime is 71216419. The reversal of 71216401 is 10461217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42315025 + 28901376 = 6505^2 + 5376^2 .

It is a cyclic number.

It is not a de Polignac number, because 71216401 - 2¹ = 71216399 is a prime.

Together with 71216399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71216491) 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, 35608200 + 35608201.

It is an arithmetic number, because the mean of its divisors is an integer number (35608201).

Almost surely, 2^71216401 is an apocalyptic number.

It is an amenable number.

71216401 is a deficient number, since it is larger than the sum of its proper divisors (1).

71216401 is an equidigital number, since it uses as much as digits as its factorization.

71216401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 71216401 is about 8438.9810403863. The cubic root of 71216401 is about 414.5020417288.

Adding to 71216401 its reverse (10461217), we get a palindrome (81677618).

It can be divided in two parts, 71216 and 401, that added together give a palindrome (71617).

The spelling of 71216401 in words is "seventy-one million, two hundred sixteen thousand, four hundred one".