71528917 has 2 divisors, whose sum is σ = 71528918. Its totient is φ = 71528916.

The previous prime is 71528893. The next prime is 71528921. The reversal of 71528917 is 71982517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70997476 + 531441 = 8426^2 + 729^2 .

It is a cyclic number.

It is not a de Polignac number, because 71528917 - 2¹⁹ = 71004629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71528917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71528117) 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, 35764458 + 35764459.

It is an arithmetic number, because the mean of its divisors is an integer number (35764459).

Almost surely, 2^71528917 is an apocalyptic number.

It is an amenable number.

71528917 is a deficient number, since it is larger than the sum of its proper divisors (1).

71528917 is an equidigital number, since it uses as much as digits as its factorization.

71528917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 40.

The square root of 71528917 is about 8457.4769878493. The cubic root of 71528917 is about 415.1074710775.

The spelling of 71528917 in words is "seventy-one million, five hundred twenty-eight thousand, nine hundred seventeen".