71204009 has 2 divisors, whose sum is σ = 71204010. Its totient is φ = 71204008.

The previous prime is 71203997. The next prime is 71204051. The reversal of 71204009 is 90040217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39337984 + 31866025 = 6272^2 + 5645^2 .

It is a cyclic number.

It is not a de Polignac number, because 71204009 - 2⁸ = 71203753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71204059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35602004 + 35602005.

It is an arithmetic number, because the mean of its divisors is an integer number (35602005).

Almost surely, 2^71204009 is an apocalyptic number.

It is an amenable number.

71204009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71204009 is an equidigital number, since it uses as much as digits as its factorization.

71204009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 71204009 is about 8438.2467965804. The cubic root of 71204009 is about 414.4779985441.

The spelling of 71204009 in words is "seventy-one million, two hundred four thousand, nine".