71650009 has 2 divisors, whose sum is σ = 71650010. Its totient is φ = 71650008.

The previous prime is 71649989. The next prime is 71650027. The reversal of 71650009 is 90005617.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45158400 + 26491609 = 6720^2 + 5147^2 .

It is a cyclic number.

It is not a de Polignac number, because 71650009 - 2⁹ = 71649497 is a prime.

It is equal to p_4209427 and since 71650009 and 4209427 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71650069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35825004 + 35825005.

It is an arithmetic number, because the mean of its divisors is an integer number (35825005).

Almost surely, 2^71650009 is an apocalyptic number.

It is an amenable number.

71650009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71650009 is an equidigital number, since it uses as much as digits as its factorization.

71650009 is an evil number, because the sum of its binary digits is even.

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

The square root of 71650009 is about 8464.6328331476. The cubic root of 71650009 is about 415.3415855087.

The spelling of 71650009 in words is "seventy-one million, six hundred fifty thousand, nine".