71565797 has 2 divisors, whose sum is σ = 71565798. Its totient is φ = 71565796.

The previous prime is 71565757. The next prime is 71565817. The reversal of 71565797 is 79756517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36590401 + 34975396 = 6049^2 + 5914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71565797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71565757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35782898 + 35782899.

It is an arithmetic number, because the mean of its divisors is an integer number (35782899).

Almost surely, 2^71565797 is an apocalyptic number.

It is an amenable number.

71565797 is a deficient number, since it is larger than the sum of its proper divisors (1).

71565797 is an equidigital number, since it uses as much as digits as its factorization.

71565797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 463050, while the sum is 47.

The square root of 71565797 is about 8459.6570261447. The cubic root of 71565797 is about 415.1788013582.

The spelling of 71565797 in words is "seventy-one million, five hundred sixty-five thousand, seven hundred ninety-seven".