71560009 has 2 divisors, whose sum is σ = 71560010. Its totient is φ = 71560008.

The previous prime is 71560003. The next prime is 71560037. The reversal of 71560009 is 90006517.

It is a happy number.

It is an a-pointer prime, because the next prime (71560037) can be obtained adding 71560009 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52243984 + 19316025 = 7228^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 71560009 - 2⁷ = 71559881 is a prime.

It is not a weakly prime, because it can be changed into another prime (71560003) 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, 35780004 + 35780005.

It is an arithmetic number, because the mean of its divisors is an integer number (35780005).

Almost surely, 2^71560009 is an apocalyptic number.

It is an amenable number.

71560009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71560009 is an equidigital number, since it uses as much as digits as its factorization.

71560009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 71560009 is about 8459.3149249806. The cubic root of 71560009 is about 415.1676083032.

The spelling of 71560009 in words is "seventy-one million, five hundred sixty thousand, nine".