71525621 has 2 divisors, whose sum is σ = 71525622. Its totient is φ = 71525620.

The previous prime is 71525617. The next prime is 71525627. The reversal of 71525621 is 12652517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 31696900 = 6311^2 + 5630^2 .

It is an emirp because it is prime and its reverse (12652517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71525621 - 2² = 71525617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71525627) 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, 35762810 + 35762811.

It is an arithmetic number, because the mean of its divisors is an integer number (35762811).

Almost surely, 2^71525621 is an apocalyptic number.

It is an amenable number.

71525621 is a deficient number, since it is larger than the sum of its proper divisors (1).

71525621 is an equidigital number, since it uses as much as digits as its factorization.

71525621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 29.

The square root of 71525621 is about 8457.2821284382. The cubic root of 71525621 is about 415.1010950304.

The spelling of 71525621 in words is "seventy-one million, five hundred twenty-five thousand, six hundred twenty-one".