71207621 has 2 divisors, whose sum is σ = 71207622. Its totient is φ = 71207620.

The previous prime is 71207597. The next prime is 71207623. The reversal of 71207621 is 12670217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67650625 + 3556996 = 8225^2 + 1886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71207621 is a prime.

Together with 71207623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71207623) 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, 35603810 + 35603811.

It is an arithmetic number, because the mean of its divisors is an integer number (35603811).

Almost surely, 2^71207621 is an apocalyptic number.

It is an amenable number.

71207621 is a deficient number, since it is larger than the sum of its proper divisors (1).

71207621 is an equidigital number, since it uses as much as digits as its factorization.

71207621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 71207621 is about 8438.4608193675. The cubic root of 71207621 is about 414.4850069005.

Adding to 71207621 its reverse (12670217), we get a palindrome (83877838).

It can be divided in two parts, 7120 and 7621, that added together give a palindrome (14741).

The spelling of 71207621 in words is "seventy-one million, two hundred seven thousand, six hundred twenty-one".